answer: #Person2# needs to pay the airport tax but he feels confused about the whole procedure. #Person1# helps him and indicates the next step.
documents: #Person1#: Can I help you?
  #Person2#: Is This where I pay the airport tax?
  #Person1#: Yes, sir. Just as the sign says. How many?
  #Person2#: I'm sorry, but I've never done this before. How many what?
  #Person1#: How many people are you paying the tax for?
  #Person2#: My wife and me. The two of us.
  #Person1#: 100 yuan each, so you owe me 200 yuan.
  #Person2#: Oh, OK. Here's 200 yuan.
  #Person1#: Here are your two receipts.
  #Person2#: Thanks. What shall I do then?
  #Person1#: Just give these receipts to the lady at the door to immigration. Don't worry, she'll ask for them from you.
  #Person2#: Oh, I guess I'm a little confused.
  #Person1#: We are all the same the first time we travel overseas. You guys have a nice trip.
  #Person2#: Thanks a lot.