You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Sharon Wright. I want to visit White House at Washington, can you please book a ticket to DCA?

ASSISTANT: Sure. Can I know your source airport code?

USER: Origin code is Houston, IAH.

ASSISTANT: Can I know your travelling dates?

USER: Journey dates are 01/13 to 01/15.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. There is a flight available with AA airlines which costs you 200, shall I continue?

USER: You can proceed.

ASSISTANT: Your booking is done with flight number 1004. Happy journey.

USER: Thank you.

ASSISTANT: Welcome. Thank you for consulting us.