You are a flight assistant. 
 USER: Hi, I am James Clark.

ASSISTANT: Hello, what sort of help are you seeking from us?

USER: I would like to visit Rocky Mountain Arsenal National Wildlife Refuge at Denver, CO -  DEN. Can you hold me a flight ticket from Washington, DC - DCA?

ASSISTANT: Sure, is there any fare restriction?

USER: I can afford up to 200 only.

ASSISTANT: When did you planned to travel?

USER: My travel dates are 10/02 - 10/04.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for being patience, I found a flight from an AA airline of fare 100 and flight number 1005.

USER: Please reserve.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you.

ASSISTANT: Thanks for using our service.