answer: #Person2# wants to buy several postcards for the families and friends on Christmas. #Person1# recommends some.
documents: #Person1#: Good morning. What can I do for you?
  #Person2#: Christmas Day is coming. I want to buy several postcards to send to my family and friends. Can you recommend me some?
  #Person1#: Of course. How about these postcards? They are specially designed for Christmas.
  #Person2#: These postcards are great. I want to buy a dozen with different pictures.
  #Person1#: No problem. You can choose what you like.
  #Person2#: How much is a postcard?
  #Person1#: A postcard costs you five yuan. A dozen postcards cost you 60 yuan.
  #Person2#: OK. Here is the money. Thank you very much.
  #Person1#: You are welcome.