answer: #Person2# wants to buy a gift for #Person2#'s younger brother and #Person1# finally recommends a handkerchief.
documents: #Person1#: May I help you, sir? 
  #Person2#: Yes, please. I'd like to buy a gift for my younger brother. He's going to take a trip to South America. 
  #Person1#: By air or by sea? 
  #Person2#: By air. So my gift should be quite light. What can you suggest? 
  #Person1#: How about this wallet? It's made of fine leather. 
  #Person2#: My sister already gave him one. I like something unusual. 
  #Person1#: This gift is the best for a man who has everything. 
  #Person2#: Oh, a nice handkerchief. That's a great idea. I'll take it.