answer: #Person1# asks Professor Li where to buy art supplies for #Person1#'s eight-year-old niece as a birthday gift.
documents: #Person1#: Professor Li, do you know where to buy art supplies?
  #Person2#: For what? Are you taking up painting?
  #Person1#: No. I can't paint. I'm asking for my niece. She is really into it.
  #Person2#: Oh, good. How old is your niece?
  #Person1#: She is eight. Actually, I'm buying a good set of art supplies for her as a birthday gift.
  #Person2#: It's a wise thing to do. Art will do a child a world of good.