Someone letting me and my husband sit together on the plane?

We will be going on a 1 hour 30 minute flight and reserving a seat in advance is pretty expensive.

We really want to sit beside each other, no matter where it is, do you think that someone would be kind enough to let me/my husband sit in their seat so we can stay together?
Update: Gosh, all I want is a general answer,
not answers where people are so judgemental on my thoughts on the matter.
1. We aren't cheap, we're students on a tight budget, we're lucky to even be going on any trips.
2. I'm a very conscious person, I don't hold any high demanding expectations for anyone to move for me.
3. I do want to sit beside him because it's the first time we've ever travelled together, I almost never see him and flying together is a whole new experience for us.

We really want to sit beside each other. 
WE are too cheap to pay the price to reserve. 
We expect someone to just move. 

They might you ask NICELY. 
You make 90 minutes being a few feet apart seem like an eternity. 
Some people actually prefer the window seat and PAY for it. Some prefer the Aisle and Pay for it. 
You want TWO cheap seats and hope someone wants to give up their premium seat. 
What does this kind passenger get out of the deal? Would you maybe buy them a drink? 

We are not being MEAN we are being HONEST 
on a tight budget, we're lucky to even be going on any trips. So be lucky you are on a trip. 
Now you complain for 90 minutes of it you cannot cuddle with each other TOO BAD you will survive the separation anxiety. 

2 Very GOOD. You can ASK DO NOT BEG Some will do it some just will not. 
3 Most couples like to sit next to each other that is normal. Sometimes for many reasons it is not possible. Just the way it is. 
You can ask. DO NOT be offended if someone does not want to give up their seat for whatever reason they have to want it. 
Sometimes you just need to pay a little more to get what you want. When you want the bargain price sometimes there is some other cost just part of deal. Get used to it. 
Enjoy your time together when you get OFF the plane.If you cannot sit beside each other. 

Just the way it is in the real world. You do not always get everything you want.

If the plane has lots of empty seats not much of an issue. If the plane is full it is full. You make 90 minutes seem like weeks and weeks.

If you really want to sit by your husband then the only way you are going to be able to guarantee you can do that is to pay the extra fee to reserve specific seats. 

If you check-in at the same time, it is possible that if there are two seats together they will give you those. But again nothing is guaranteed. So you may want to try checking in ASAP. 

If you forego that, you can hope that someone would be nice enough to switch seats in order for you to sit together. But if you have a middle seat or already a "less than desirable" seat you aren't going to get someone to give up a Aisle or Window seat for you. Then you add in the people that did go ahead and pay reserve their seat, you are going to find them less than willing to switch with someone who didn't pay the extra amount. 

You could try the "sob" story. But realize that there are probably more than a few people on that plane who also made the decision to not sit together when they really wanted to. They aren't going to give you much sympathy. 

You could attempt to get to the gate and talk to the agent there to see if they can switch you. But then that all depends on what may be available, and how many people have requested the same thing. If you have 5 people asking to be switched with 1 seat available, and one of those 5 people have a high status on the airlines frequent flyer program...you aren't getting it..they are

Probably. As the previous answer says, if either you or your husband have a window or aisle seat, it's often pretty easy to trade that for a middle seat. There are also some other relatively undesirable seats on planes. The ones near the restrooms, for instance. Or the back row, where the seats often don't recline. 

Or if the airline has assigned seating, get to the gate early and explain your situation to the gate attendant. There may be some other vacant seats that you can be moved to.

If someone else paid for the seat that one of you wants, they aren't likely to give it up for you. 

If one of you is willing to take someone's middle seat in exchange for a window or aisle seat, then you might have luck. You might also find that the seats assigned to you by the airline are together. 

But the only way to guarantee that you're together is to pay for your seat selection. 

A 90-minute flight isn't that long though. I'm sure you'll be okay if you have to sit apart.

Not anymore. What about the people who DID pay the money to reserve their seats? 
Pretty rude of you to expect them to give up a seat they PAID EXTRA for. 

Ironically, this just happened to me a couple of weeks ago. As an elite flyer with American Airlines, I get free Main Cabin Extra seating and chose a window which would have been $45 extra. A mother and daughter were apparently booked in middle MCE seats, not sure if that was last minute or her original plan all along to save money ($20 for middle verses $35 for aside and $45 for window). Anyhoo, she asked a few of us but a flight attendant stepped in and specifically pointed out the pricing differences and how unfair it was to try and get people to switch. The FA then offered 2 free drinks and a free snack and I quickly volunteered my seat. But the FA was correct. I certainly don't agree how airlines are pricing pre-selected seats but there's not much that can be done. 

So, the moral of the story is if you want to sit next to your child, you're going to have to cough up the money.

As previously posted, the only way to guarantee sitting next to each other is to pay the premium. If the both of you are in the same row, it may (or may not) be difficult to ask a fellow passenger to switch. 

If the two of you are in separate rows, you'd have to ask the FA's if it is possible for you to move followed by asking passengers around either one of you if they are willing to switch seats. If the cabin is wide open and there are empty seats next to either one of your assigned seats , you should still ask the FA if you could move

Why should I have to move from my carefully pre-selected and paid for seat just because YOU are too cheapskate to pre-select? 

I've never seen an airline where pre-selection is more than $30. If you can afford the flight, you can afford the pre-selection. Suck it up.