answer: #Person1# wants to fly to Toronto. #Person2# suggests #Person1# fly on Northwest Airlines to Berlin and then have a connecting flight on Canada Airline to Toronto.
documents: #Person1#: Do you have any direct flights to Toronto?
  #Person2#: Sorry, we don't. But I think you can fly on Northwest Airlines to Berlin and then have a connecting flight on Canada Airline to Toronto. And it is the most economical flight, just 1, 900 dollars.
  #Person1#: When does the flight depart?
  #Person2#: At 8 am. By the way, it also makes a refueling stop.
  #Person1#: How long is the layover?
  #Person2#: Less than one hour.
  #Person1#: And how long do I have to stay in Berlin for the connecting flight?
  #Person2#: Not so long, just one hour.
  #Person1#: So the time for the total journey is about. . . ?
  #Person2#: About 13 hours.
  #Person1#: Let me count. Ok, it works out for my schedule. Thanks a lot!
  #Person2#: You are welcome!