You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me in booking my flight ticket from AUS to IAH?

ASSISTANT: Sure, may I know your name please?

USER: Myself, Carolyn Nelson.

ASSISTANT: Tell me your travel dates please?

USER: My planned travel dates are Feb 13-15.

ASSISTANT: Are you looking for a stopover in your journey?

USER: I would prefer direct flight.

ASSISTANT: Any other preferences?

USER: No more preferences.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you.