answer: #Person2# wants to buy a fashionable diamond ring for his fiancee. #Person1# gives him recommendations.
documents: #Person1#: Can I help you, sir?
  #Person2#: I wish to buy a diamond ring.
  #Person1#: How many carats would you like it to be?
  #Person2#: I want five carats.
  #Person1#: Is this one suitable for you?
  #Person2#: No, it seems too old-fashioned to my fiancee.
  #Person1#: What about this?
  #Person2#: It seems too small for me, haven't you got any larger ones?
  #Person1#: Then you can buy this one. It's very nice and latest in style.
  #Person2#: Oh, this one is perfect.