answer: #Person2#'s helping #Person1# check out a biography which #Person1# cannot remember the title and the author.
documents: #Person1#: Could you please help me to check out the book?
  #Person2#: Sure, what's the author's name, please.
  #Person1#: I can't remember that clearly. It probably be Charles...
  #Person2#: Charles Dickens?
  #Person1#: No, no, no. I'm not interested in literature.
  #Person2#: OK, do you know the title of the book?
  #Person1#: Oh, sorry. I'm always absent-minded. I remember that I've put a note in my pocket.
  #Person2#: So, show me the note please.
  #Person1#: I can't find it now.
  #Person2#: Oh, such bad luck, sir. Can you please name the category of the book?
  #Person1#: Let me see. It's not fiction. It's biography.
  #Person2#: OK, I'll search it for you. A moment, please.
  #Person1#: Thanks.