You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: Can you please book a flight ticket from DTW to DEN?

ASSISTANT: Sure, let me know your travelling dates?

USER: Thank you. I have planned my travel  dates as Nov 22 and Nov 24.

ASSISTANT: Do you have any connection limit?

USER: I am looking for single connecting flight.

ASSISTANT: Is there any other preferences?

USER: No, I do not have any other specifications.

ASSISTANT: May I know your good name?

USER: Sure, myself William Hall.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey routes.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Most welcome.