dialogue: Dona: May I help you?
  Basil: Yes, I'd like to book 3 seats to Calgary, Canada on a flight, leaving sometime before next Sunday.
  Dona: Economy class?
  Basil: Yes.
  Dona: One way or round trip?
  Basil: One way.
  Dona: There aren't any direct flight, sir. You will have to change in Vancouver.
  Basil: That's alright.
  Dona: There is a Canadian Airlines flight 30 leaving Beijing next Friday at 10 o'clock am. It has 3 seats available. Will that be alright?
  Basil: That's fine.
  Dona: Your name, please.
  Basil: BASIL, Basil. How much is the ticket?
  Dona: $580 for one.
summary: Dona helps Basil book three seats of economy class to Calgary, Canada on a flight next Sunday.