You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need you to book flight ticket from IAH to AUS. Please help me.

ASSISTANT: Sure, can you please let me know your trip dates?

USER: March 4 and 6 are my planned travelling dates.

ASSISTANT: Do you prefer connecting flight or direct flight?

USER: I would prefer to fly in a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I would like to fly in a business class flight.

ASSISTANT: Could you help me with your name please?

USER: Stephen Carter here.

ASSISTANT: Please allow me 2-3 minutes.

USER: No hurry, no worry. Take your time.

ASSISTANT: Thank you for waiting, Stephen Carter.

USER: You are welcome.

ASSISTANT: Stephen Carter, I am afraid that there is no flight available as per your needs for the mentioned dates.

USER: I know some times it happens. Nothing to worry. Thanks for your time.

ASSISTANT: Thank you for reaching us! Have a great day.