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

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me to book a direct flight for my journey to AUS from ATL in the month of September?

ASSISTANT: Sure, may I know your planned dates of journey please?

USER: Sure, my planned dates are 09/15 and 09/17.

ASSISTANT: Please wait for a moment to check for the availability.

USER: Sure, I will be waiting for your response.

ASSISTANT: Sorry Moore, there is no flight found as per your travelling details.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: You are welcome.