answer: #Person2# helps #Person1# to send a letter by airmail to America.
documents: #Person1#: Hello, I've got a letter here that I'd like to post.
  #Person2#: Yes, where's it to, madam?
  #Person1#: Well, the letter is going to a friend of mine in America and it's quite urgent. It really needs to be posted today, so here you are.
  #Person2#: You want to send it airmail, madam?
  #Person1#: I do want to send it airmail, yes.