You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I am Ryan Turner. Can you please reserve me a flight ticket which is having it's depart time in the evening?

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

USER: I have planned to travel on Mar 2nd and return on Mar 04th.

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

USER: I would like to fly from IAD to LGA.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Ryan Turner, no flight is available to you on your dates.

USER: Ok, no problem. Thank you.

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