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