answer: #Person2# invites #Person1# to lunch but #Person1# already has an engagement.
documents: #Person1#: How have you been?
  #Person2#: Fine, thank you.
  #Person1#: And how's everyone in your family?
  #Person2#: Very well, thank you. I'm meeting my wife and daughter for lunch at 12:00, would you care to join us?
  #Person1#: I'd love to but I'm afraid I can't. I'Ve already got a lunch engagement.