You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Michelle Phillips here. Can you please reserve me a flight ticket from AUS to PHL?

ASSISTANT: Sure, may I know your trip dates please?

USER: Sure, my travel dates are from July 09 to July 11.

ASSISTANT: Well, do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Ok, please wait for a minute.

USER: Please make sure that my departure time should be in the evening and return time is morning.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: That's ok, no issues. Thank you for the information.

ASSISTANT: My pleasure.