You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Can you find a flight for me from IAH to AUS?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: Ok, my planned dates are from July 31 to Aug 02.

ASSISTANT: Do you have any other requirements to be met?

USER: I need a direct flight.

ASSISTANT: Can I have your name please?

USER: Sure, I am Donald Green.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: It's ok, thank you.

ASSISTANT: Thank you.