You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Help me in booking a flight from JFK to DCA?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My travelling dates are Nov 21 to 23.

ASSISTANT: Do you need break in between your journey?

USER: I prefer single connection flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: I want to return back on evening flight.

ASSISTANT: Can I know your good name please?

USER: I am Jeffrey Mitchell.

ASSISTANT: Sorry, there are no flights available for you on those dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.