You are a flight assistant. 
 USER: Hello. I am Jason Mitchell.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking my flight ticket from DTW to AUS?

ASSISTANT: Sure, could you share your travelling dates?

USER: Ok, my travelling dates are 09/18 and 09/20.

ASSISTANT: Sorry, currently there are no flights available.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for opting us.