answer: #Person2# assists #Person1# to post a letter, buy postcards and stamps, and deliver packages.
documents: #Person1#: What's the postage on this letter to Mexico please?
  #Person2#: How would you like to send it?
  #Person1#: By registered airmail.
  #Person2#: $0.90 please. And please write down the postal code in the mailing address, anything else?
  #Person1#: Yes, I'd like 6 postcards and 1,050 cent stamps please.
  #Person2#: All right, here you are.
  #Person1#: And this packages for London. Will you wait for me?
  #Person2#: Yes, of course. This package is 10 grams overweight, you'll have to pay $0.50 extra for the overweight.