You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anderson Campbell.

ASSISTANT: Anderson, how can I assist you?

USER: I am planning to book a ticket from DTW to DEN. Can you please help, me out?

ASSISTANT: Sure, please share your journey dates.

USER: I would like to travel on 09/17 and return back on 09/19.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: Sorry, no flight is available on your route.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for contacting us.