need ur help, help me remember the name of this film...

All I remember is that there is a girl and a guy (I think the actress was Trisha but not 100% sure). They both get on the same train. But before they get on, they weigh themselves on the weight machine on the train platform and get a piece of paper. 

And they buy the same cookies and the same book and travel sitting across from each other. And the guy keeps throwing his trash out of the train window.

What is this film?!!!