answer: #Person1# wants to mail an important package door to door via airmail to London within three days. #Person2# charges #Person1# 500 dollars and #Person1# asks for the receipt to trace the package.
documents: #Person1#: Excuse me, Ma'am. I would like to mail this package door to door via airmail to London. It is a very important package and has to be sent within 3 days.
  #Person2#: No problem. But, the postage is much higher than the regular package.
  #Person1#: That's fine with me. I am willing to pay for it as long as you can guarantee me the package can arrive in time.
  #Person2#: OK. All the registered airmail packages can be received in 5 working days.
  #Person1#: I see. How much do I need to pay in total for this package?
  #Person2#: It's 500 dollars.
  #Person1#: Can I have the receipt? Just in case I can trace it if something goes wrong.
  #Person2#: Sure! Please just fill in your I. D. number and ways to contact you here.
  #Person1#: Do I need to include my zip code in the address?
  #Person2#: You had better include that because it is easier for the mailmen to find the correct mailing address.
  #Person1#: Thank you very much. Here is 500 dollars.
  #Person2#: Here is your receipt. Contact us if your friend still doesn't receive the package after 5 work days.