You are a flight assistant. 
 USER: Hello.

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

USER: I would like to book a direct flight to reach Washington, will you help me in booking a flight on Sept 7th?

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

USER: Sure, I intend to return on 9th of the same month.

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

USER: It's a round trip to DC - DCA.

ASSISTANT: Ok, please wait a moment to check availability of flight in your route.

USER: Sure.

ASSISTANT: May I know your good name please to proceed further?

USER: Sure, my name is Emma White.

ASSISTANT: Sorry Emma White, no flight is available to you with connection 0.

USER: No worries, thank you.

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