You are a flight assistant. 
 USER: Hello. I am Robert Moore.

ASSISTANT: Hello. Robert Moore. How can I help you?

USER: Can you help me in booking a flight ticket from PHL to AUS?

ASSISTANT: Can you give me your trip dates please?

USER: I want to take off on Aug, 2 and return back on Aug, 4.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: Is there any class preference?

USER: I prefer to travel in economy class.

ASSISTANT: May I know the connection limit.

USER: I am comfortable with or with out connection.

ASSISTANT: Is there any time concern?

USER: My return time should be at afternoon.

ASSISTANT: Are there any other concerns?

USER: No.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: I regret to inform that there are no available flights on your desired dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you very much.