It is about this man and woman who ditch a blind date but end up meeting each other anyway and they go out for a while and fall in love. The boy says that they'll meet at a tree in a park a year later but when she goes there is only a letter there waiting for her. They end up meeting at another blind date and live happily ever afer

Sounds like Sleepless in Seattle but could be wrong

I just posted a question about what I would guess is the same movie, except I thought it was the girl that went away... did you end up working out what the movie was?

Found it... the movie is My Sassy Girl :)