You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I am Ashley Carter. I would like to book a flight which depart in the evening time. Could you please help me with booking a flight ticket?

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

USER: Sure, I would like to depart on Feb 1 and arrive on Feb 3.

ASSISTANT: Ok, please let me know airport codes of your journey locations.

USER: Sure, my travelling locations are IAD and ATL.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Ashley Carter, no evening flight is available to you on your dates.

USER: Ok, no problem.

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