answer: #Person2# helps #Person1# to check-in.
documents: #Person1#: Hi, I'm here to check in.
  #Person2#: Would you please fill out this registration 1 form?
  #Person1#: Thank you. . . Excuse me, sir. You forgot to fill in your visa number.
  #Person2#: Did I? Let me see that. . . Oh, sorry. . . here you are.