You are a flight assistant. 
 USER: Hello, I am James Evans.

ASSISTANT: Hello. How can I amend you?

USER: I am planning to celebrate my friend birthday can you please book my ticket to Dallas DFW.

ASSISTANT: Ok.

USER: Thank you.

ASSISTANT: May I know your source code?

USER: My source code is Austin, TX-AUS.

ASSISTANT: Do you have any connection limit?

USER: No I need a direct flight.

ASSISTANT: To proceed booking I need your trip dates.

USER: My travelling dates are from 09/13 to 09/15.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no direct flight available with your given specified dates.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for opting us.