You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Please reserve me a flight ticket from IAD to AUS.

ASSISTANT: Sure, I am happy to help you. Can you please let me know your travelling dates?

USER: My travel dates are Sept 23 and Sept 25.

ASSISTANT: Do you prefer any stopover in between journey?

USER: Yes, I need a stop over in between my journey.

ASSISTANT: May I know your good name?

USER: I am Catherine Smith.

ASSISTANT: Is there any other specifications for you?

USER: I would like to depart in the evening time.

ASSISTANT: Sorry, we are unable to provide flights on your journey routes.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.