answer: #Person1# helps #Person2# to book a flight from Beijing to Shanghai. #Person2# pays by card.
documents: #Person1#: Can I help you, sir?
  #Person2#: Yes, I want to book a plane ticket from Beijing to Shanghai.
  #Person1#: OK. Which day do you want to book?
  #Person2#: The day after tomorrow.
  #Person1#: Which flight do you want?
  #Person2#: I'd prefer a morning flight.
  #Person1#: What about Flight 516?
  #Person2#: Book it for me, please. How much should I pay?
  #Person1#: 1 500 yuan. How will you pay for this, sir?
  #Person2#: Credit card.
  #Person1#: OK. Here's your ticket.
  #Person2#: Thank you.