You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself David Wilson here.

ASSISTANT: How can I help you at this moment?

USER: I need to book a flight ticket from Detroit DTW to Denver DEN. Can you please help me in booking a flight ticket?

ASSISTANT: Sure, I will help you with this. Can you please provide your journey dates to proceed further?

USER: My journey dates are 01/14 and 01/16.

ASSISTANT: Wait a moment please.

USER: Sure, I will wait for your response.

ASSISTANT: David Wilson, there are no flight services available on this route on your provided dates.

USER: It's ok, no problem. Anyway, thank you for your kind information.

ASSISTANT: Thank you for utilising our service.