You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Raymond Allen.

ASSISTANT: Raymond Allen, how can I render you today?

USER: I am planning to book a ticket from DCA to CLT. Can you please help me out?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I am planning to travel on Nov 25 and return back on Nov 27.

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

USER: Yes, I am looking for a direct flight.

ASSISTANT: Sorry Raymond Allen, there are no direct flights available on that route.

USER: That's fine, thank you for your service.

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