You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you today?

USER: Christopher Allen here. I am planning a trip with my friends to New York, so I want to book tickets from Washington.

ASSISTANT: Allen, could you please mention your dates of journey to reach your destination?

USER: My departure date is on 07/30 and return on 08/01.

ASSISTANT: Ok, may I know your airports codes please?

USER: I am departing from DCA airport and landing in New York EWR airport.

ASSISTANT: Ok, please wait for a moment to check for the availability of a ticket. The flight with connections limit is 1 of cost 100 has found.Shall I book it?

USER: Please proceed for booking.

ASSISTANT: Your booking is done with airline AA and flight number is 1018.

USER: Thanks for your help.

ASSISTANT: You are welcome and hope you have a safe flight.