answer: #Person2# buys a pair of black shoes with #Person1#'s assistance.
documents: #Person1#: Can I help you, sir?
  #Person2#: Yes, please. I'd like to have a pair of shoes.
  #Person1#: What size would you like, please?
  #Person2#: Size eleven.
  #Person1#: OK. What about this pair?
  #Person2#: Sorry, I don't like white. Have you got any other colors?
  #Person1#: Oh, yes. We have also got blue, brown and black.
  #Person2#: Can I have a look at the black ones? Black is my favourite colour.
  #Person1#: Sure. Here you are.
  #Person2#: They look nice. What's the price?
  #Person1#: Fifty dollars.
  #Person2#: May I try them on?
  #Person1#: Yes, please.
  #Person2#: OK. I'll take this pair. Here's the money.
  #Person1#: Thank you.