You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to book a flight ticket to attend a fun fair in IAH. Can you please help me in help me in booking a flight ticket from AUS?

ASSISTANT: Sure, we are mirthful to help you.

USER: Thank you.

ASSISTANT: May I know on which dates you are willing to travel?

USER: I would like to depart on June 22 and intend to return on June 24.

ASSISTANT: Do you require any stopover in between your journey?

USER: No, I would like to prefer a direct flight.

ASSISTANT: May I know your name for further process?

USER: I am Nicholas Parker.

ASSISTANT: Please, hold on I will check the availability of flights and revert you.

USER: Ok.

ASSISTANT: Thanks for waiting. There are no flights found to your route on your specified travelling dates.

USER: OK, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.