answer: #Person1# asks #Person2# to walk through the doorway again for airport security and #Person2# embarrassedly finds a set of keys in her pockets.
documents: #Person1#: Put all baggage on the conveyor belt. Walk through the detector gate one at a time, please. Excuse me, ma'ma. Could you walk back through the doorway again, please?
  #Person2#: What for?
  #Person1#: Airport security. Could you empty your pockets over here, please?
  #Person2#: Really? I'm in a hurry. All right.
  #Person1#: Ah, a set of keys.
  #Person2#: I'm embarrassed! I forgot completely about them. I'm terribly sorry.
  #Person1#: That's all right. Enjoy your flight.
  #Person2#: Thank you.