Save your boarding pass and you'll get a refund on the difference.
5 seconds sound clip from the Planes, Trains & Automobiles (1987) movie soundboard.
You can hear this line at 00:09:22 in the Blu-ray version of the movie.
Quote context
[...]
- Hi, Liz.
- Here okay? How about over there?
- Oh, here, there. Anywhere's fine.
- Save your boarding pass and you'll get a refund on the difference.
- Look, I've had just about enough of you. Now take your seat.
- Oh, you've had about enough of me?
- First you delay me, then you bump me.
- I can't wait to see what happens next?
[...]