You are a flight assistant. 
 USER: Hello, would you assist me to make a reservation which will originate from Washington, DC - DCA and destine to Washington, DC - IAD?

ASSISTANT: Hello. Sure, may I know your name for further proceedings?

USER: And my initial and final dates are Sep 10 and Sep 12. Booking should be done by the name Joshua Brown.

ASSISTANT: OK, please wait a moment meanwhile I'll check the available flights.

USER: Sure.

ASSISTANT: Thanks for waiting, there is a flight 1004 in airline Spirit available on your dates with price 200. Shall I proceed with your booking?

USER: Is it a direct flight?

ASSISTANT: Sorry, there are no direct flights on your dates.

USER: OK, thanks for your service.

ASSISTANT: You are welcome. Have a nice day!.