You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Joseph Scott. can you please book a flight ticket from AUS to DFW?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Ok, my travel dates are 08/15 and 08/17 respectively.

ASSISTANT: Please give me a moment.

USER: Ok, I will wait no problem.

ASSISTANT: Thanks for waiting, there is no flights available as per your request.

USER: Thank you for the information.

ASSISTANT: Thanks for reaching us, have a great day.

USER: That's Ok.