dialogue: #Person1#: Can I help you, sir? 
  #Person2#: I want to find a book called Gone with the Wind. But I can't find it. 
  #Person1#: Let me give you a hand. The author is. . . 
  #Person2#: Margaret Mitchell. 
  #Person1#: Oh, yes. Here it is. 
  #Person2#: Thank you very much. I have been looking for it for a long time. Is this the latest edition? 
  #Person1#: Yes, we have both the paperback and hardcover. which would you want to buy? 
  #Person2#: How about the price of the hardcover? 
  #Person1#: It's $25. 
  #Person2#: A little bit expensive, but I will buy one. This is $25 , here you are. 
summary: #Person2# buys a hardcover of Gone with the Wind for $25 with #Person1#'s help.
topic: buy a book