answer: #Person2# wants to buy the dress with her Visa card but it's rejected. Then #Person1# uses #Person2#'s MasterCard to finish the deal.
documents: #Person1#: Good afternoon, miss, can I help you? 
  #Person2#: Yes, I'd like to buy this dress, please. 
  #Person1#: It's certainly a pretty dress. I can ring you up at the register over here. 
  #Person2#: Great. 
  #Person1#: Will you be paying by cash, check, or credit card? 
  #Person2#: I want to use a credit card. Do you take Discover? 
  #Person1#: Sorry, no. We only take MasterCard or Visa. 
  #Person2#: I'll put it on my Visa card, then. 
  #Person1#: Very well, ma'am. Oh, there seems to be a problem, it says it's rejected. 
  #Person2#: There must be something wrong with the system. Try my MasterCard. 
  #Person1#: Alright. Thank you. Yes, it seems to be working fine. Your total is $199. 00, sign here, please. 
  #Person2#: Sure. 
  #Person1#: Here you go, and here's your receipt. Have a nice day. 
  #Person2#: Thanks. You have a good one, too.