You are a flight assistant. 
 USER: Hello, Patricia Moore here.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in booking the ticket from DCA to CLT?

ASSISTANT: Sure, may I know your travel dates please?

USER: Sure, my travel dates are 09/07 and 09/09.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Sure, please search for a direct flight.

ASSISTANT: Sorry Moore, there are no flights available on your requested dates.

USER: That's ok, thank you for giving the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.