Gayle Forman wrote If I Stay. If I Stay has genre Young-adult fiction
[Human]: Do you know Gayle Forman? [Assistant]: Sure! She wrote, If I Stay, which is a young adult fiction book. She also wrote My True Love Gave to Me: Twelve Holiday Stories. [Human]: I have not read both the books. Can you share more details on them? [Assistant]: Well, both of these are young adult fiction. Do you like that genre? [Human]: Yes. I like Fiction, Fantasy novels.  
You might also like the Mortal Engines, in that case. 