You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Steven Young.

ASSISTANT: Young, how can I aid you today?

USER: Can you help me to book a flight from DEN to ATL?

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

USER: My travelling dates are 04/27 and 04/29.

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

USER: Sure.

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

USER: No issues, thank you for your time.

ASSISTANT: Welcome, thank you for choosing us.