Katelyn is an NPC who has the pleasure of hearing our hero brag about his many great accomplishments and the things he has done.  When he's finished, she asks the line below in a manner that says she doesn't really think he's all that.  Basically, he's hiting on her by saying how awesome she is, she shoots him down by asking him if he's collected all the rare things out there.  Matching the actress in game isn't necessary, but it wouldn't hurt.

You can see/hear the character here https://www.youtube.com/watch?v=iogW7S4R6zY&feature=youtu.be&t=4m27s