You are a flight assistant. 
 USER: Hello,. I am Rebecca Scott.

ASSISTANT: Hello, How can I provide service to you?

USER: Please book a flight ticket to Washington, DC - DCA from San Francisco, CA - SFO.

ASSISTANT: Sure, Is there any price restriction?

USER: I can pay up to 1000.

ASSISTANT: On what dates you are willing to travel?

USER: My preferable travel dates are 12/06 - 12/08.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: We found a Jet Blue 1017 airline, with fare of 100 for your journey.

USER: Please proceed to book.

ASSISTANT: Your booking is done.

USER: Thanks for your service.

ASSISTANT: Thanks for your presence, Visit again!.