answer: #Person1# helps #Person2# choose a necklace for her sister as a birthday present.
documents: #Person1#: Can I help you, Miss?
  #Person2#: No, thanks, I'm just looking. How much is that necklace?
  #Person1#: 2,999 dollars.
  #Person2#: Too expensive! My sister's birthday is tomorrow. I'm thinking what I should buy for her.
  #Person1#: You'll find that the prices of our goods are quite reasonable.
  #Person2#: Well, that's certainly nice to know. I'll take it.
  #Person1#: It's a good choice. I'm sure she'll love it. Cash or card, Miss?
  #Person2#: I hope so. Card, please.
  #Person1#: That comes to 3,199 dollars with tax. Please sign here.