You are a flight assistant. 
 USER: Hello, I am Michael Collins.

ASSISTANT: Hello, how can I aid you for today?

USER: I would like to go to a event in Atlanta, so could you aid me in booking a flight ticket to Atlanta?

ASSISTANT: I am here to help you in booking your flight ticket. Can you please help me by providing your planned dates of journey?

USER: Sure, I would like to go on Jan 15th and return back on Jan 17th.

ASSISTANT: Could you please provide your respective airport codes?

USER: My source and destination airport codes are AUS and ATL respectively.

ASSISTANT: Please be on hold for sometime to check the available flight.

USER: Sure, take your time.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome, thank you for reaching us.