You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Andrew Green.

ASSISTANT: Green, how can I aid you today?

USER: I want to travel New York to promote my business. Could you please help me in booking the ticket from DEN to JFK?

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

USER: I am willing to travel on 10/16 and again I will retrieve on 10/18.

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

USER: Sure, I will wait for your response.

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

USER: Not a big deal, anyhow thank you very much for your kind service.

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