What's the title of this book?

It has a sixteen year old girl and she has to go to a fancy ball where they get to eat proper food for the first time in forever and then at the ball they get matched with the person they will marry and fall in love with and she gets her best friend (Which never really happens) and then she gets send a chip about the person who she is matched with and another persons face pops up and she knows that person too. Then over the summer she does a hiking course and she becomes friends with the person that wasn't meant to pop up on the screen and she starts to fall in love. Her dad works at a recycle plant or something like that and her grandfather dies during the story and a lot of books are banned in their area but she has this poem that her grandfather gave her that she loves. It's sort of set after a massive war and it's set in the future.... Any help would be great! Thanks :)