You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Brian White here. I am planning to reserve my ticket from ORD to DCA. Will you please help me out in booking a flight ticket?

ASSISTANT: Sure White, can I know the travel dates please?

USER: I prefer to travel on 03/18 and  return back on 03/20.

ASSISTANT: Ok, wait a moment please.

USER: Sure, I will wait for your information.

ASSISTANT: There is a flight in Frontier airline with price 200, can I book it?

USER: That's perfectly matching to my requirements, please proceed for booking the flight ticket.

ASSISTANT: Your ticket has been booked with flight number 1004.

USER: Thank you for your help in booking the flight ticket.

ASSISTANT: Thank you for approaching us.