You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Gary Lee here. I would like to book a ticket from AUS to PHL, can you please help me with that?

ASSISTANT: Sure, can you please share your travel dates?

USER: The travel dates are from 08/05 to 08/07.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight.

ASSISTANT: Do you have any other specification that you are looking for?

USER: I would like to return during afternoon time.

ASSISTANT: Gary Lee, I am sorry to inform you that there is no flight available at your request.

USER: That's ok, thank you for your help.

ASSISTANT: You are welcome. Thank you for reaching us.