[Aerith is still confused over the Zack question because she really didn't know anyone by that name. The name does sound familiar and she might have heard it from somewhere, but she doesn't personally know him. Why would she lie?]

No, I don't think so. I only know a small handful of boys and I am sure none of them is called Zack. [She catches what she says in the end.] My what...exactly? Is he a friend of yours?

[She's just as confused about this.]