In Passengers, Chris Pratt's character "Jim", apparently has no backstory to his character. When being "interviewed" by Aurora, he even avoids answering the questions properly. On the other hand, we learn why Aurora is on the trip, and even get a glimpse into her childhood.

Is there any narrative or other reason why Jim doesn't have a backstory?

EDIT: This won't affect the question much, but I'd just like to clarify the motive behind it. When I watched the movie, I found plenty of openings for Jim to reveal something personal about himself, his life, his hopes and dreams - but he never does, apart from one or two facts.

I feel this may have something to do with the "old" and "new" personas of Jim and Aurora. Aurora's motives are based on her past whereas Jim's are based on his future.