answer: #Person1#'s assisting #Person2#in getting a shirt.
documents: #Person1#: I want to buy a shirt. 
  #Person2#: What color do you like? 
  #Person1#: A white one, please. 
  #Person2#: Maybe you could have a look at this one. 
  #Person1#: What's the size? 
  #Person2#: Large. 
  #Person1#: I think a medium one will do.