answer: #Person2# uses some coupons and her credit card to pay for her bill with #Person1#'s assistance.
documents: #Person1#: Are these all yours?
  #Person2#: Yes, they are.
  #Person1#: Cash or credit card?
  #Person2#: I want to use these coupons. Have they expired?
  #Person1#: Not yet. Oh, Madam, this item is no longer on sale, and this goes on sale tomorrow. Will you take them?
  #Person2#: Yes, could you use plastic bags?
  #Person1#: Sure, it is 80 yuan in all and you have to give me another coupon.
  #Person2#: Could you charge it to my credit card?
  #Person1#: Certainly.
  #Person2#: Here you are.
  #Person1#: Okay. Input your pin number, please. Sign here.
  #Person2#: Sure.
  #Person1#: Here's your receipt.
  #Person2#: Thank you.