answer: #Person1# helps #Person2# find a collection of the 19th century European paintings.
documents: #Person1#: What exactly are you looking for?
  #Person2#: I am looking for a collection of the 19th century European paintings.
  #Person1#: Is it the book on your left, the one with the yellow cover?
  #Person2#: Let me see. Yeah, this is what I want. Thanks a lot.