answer: David Hall asks #Person2# to help him find the suitcase he left on the train to London but #Person2# gives him the wrong one.
documents: #Person1#: I left a suitcase on the train to London the other day. 
  #Person2#: Can you describe it, sir? 
  #Person1#: It's a small blue case and it's got a zip. There's a label on the handle with my name and address on it. 
  #Person2#: Is this case yours? 
  #Person1#: No, that's not mine. 
  #Person2#: What about this one? This one's got a label. 
  #Person1#: Let me see it. 
  #Person2#: What's you name and address? 
  #Person1#: David Hall, 83, Bridge Street. 
  #Person2#: That's right. D. N. Hall. 83. Bridge Street. Three pound and fifty pence please. 
  #Person1#: Here you are. 
  #Person2#: Thank you. 
  #Person1#: Hey! 
  #Person2#: What's the matter? 
  #Person1#: This case doesn't belong to me! You've given me the wrong case!