You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ronald Young.

ASSISTANT: Ronald Young, how can I aid you today?

USER: Can you help me in booking my flight ticket from DTW to IAD?

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

USER: My trip dates will be Sep 14th to Sep 16th.

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

USER: Sure.

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

USER: Its ok, thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.