You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: My name is Nancy Evans. I have planned to visit Fort Worth, so I need to book a flight ticket from IAD to DFW.

ASSISTANT: Ok, may I know your preferable travel dates?

USER: The dates are from 12/06 to 12/08.

ASSISTANT: Please allow me a moment to check for the availability of flight.

USER: Ok.

ASSISTANT: Nancy, there is a flight available with AA airline and the price 200. Shall I proceed to book a flight ticket?

USER: Yes.

ASSISTANT: Your booking is confirmed with 1006 flight number.

USER: Thank you for your help.

ASSISTANT: You are welcome. Thank you for choosing our service.