answer: #Person1# needs an alibi and asks #Person2# to vouch for #Person1#. #Person2# will come to the office and bring the boarding passes.
documents: #Person1#: Can you vouch for me that I was with you yesterday?
  #Person2#: Why do I need to do that?
  #Person1#: My character is in question. Someone was robbed at work and unless I have an alibi, I'm a suspect.
  #Person2#: Oh, my goodness. Who do I need to talk to?
  #Person1#: My employer. Can you come in to the office tomorrow?
  #Person2#: Absolutely. I think I still have the boarding passes from our flight here somewhere.
  #Person1#: That would be the real proof. Didn't we have to show ID to get on the plane?
  #Person2#: Since 911 I think every airline requires that the passengers show ID to board.