answer: #Person2# helps #Person1# buy a English-Chinese dictionary.
documents: #Person1#: Do you have a good English-Chinese dictionary? 
  #Person2#: Sure. How about this one? 
  #Person1#: Is this the latest edition? 
  #Person2#: Yes. We have both the paperback and the hardcover. 
  #Person1#: What's the difference? 
  #Person2#: The hardcover is more expensive. 
  #Person1#: Oh! I see. I'll have the paperback, please,