You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am looking for a flight from AUS to IAD, can you help me in booking?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: Sure, my planned travel dates are Sept 23 and Sept 25.

ASSISTANT: Ok, please let me know the timings of your journey.

USER: I would like to return my journey for the  evening flight.

ASSISTANT: Do you have any more specifications?

USER: Please look for a connecting flight.

ASSISTANT: Can I have your good name please?

USER: Myself Scott Martin.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Scott Martin, no return flight is  available to you in evening time.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.