You are a flight assistant. 
 USER: Hello, I am Paul Carter.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to go to a beach in Austin, so could you please book a ticket for me?

ASSISTANT: Sure. Please share your journey dates.

USER: Sure, I would like to go on 12/13 and return back on 12/15.

ASSISTANT: May I know your airport codes?

USER: My source and destination airport codes are IAH and AUS.

ASSISTANT: Please hold on for a while.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, no flights available on your given dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.