answer: #Person1# serves #Person2# to buy a tie that is the best seller.
documents: #Person1#: Can I help you? 
  #Person2#: I'd like to buy a tie to match this suit. 
  #Person1#: We have various colors. How about this one? 
  #Person2#: Well, the color is all right. But it looks outdated. Can you show me that one? 
  #Person1#: You have a very good taste. It's our best seller. 
  #Person2#: Really? 
  #Person1#: Sure! Look, it suits you well.