You are a flight assistant. 
 USER: Hi. I am Jason Thomas.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me to book a flight to HOU on 12/09?

ASSISTANT: Sure, could you please mention your source code to search for the flight?

USER: My preferable source airport code is DEN.

ASSISTANT: Ok, may I know your return date to proceed further?

USER: I would like to return on 12/11.

ASSISTANT: Ok, I found a flight 1007 in Hawaiian airline matching your details with price 200. Shall I proceed?

USER: Yes, proceed.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: You are welcome. Have a nice journey.