You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to book a ticket from DEN to DTW. Could you book a ticket?

ASSISTANT: Sure, we are happy to help you. Can you please let me know your travelling dates?

USER: Departure is on Dec, 27 and return date is Dec, 29.

ASSISTANT: Do you prefer any break in between journey?

USER: I would be comfortable with single stop over.

ASSISTANT: Are there any other specifications for you?

USER: I prefer to travel in business class.

ASSISTANT: May I know your good name?

USER: I am John Jackson.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Thank you.

ASSISTANT: Thank you for choosing us.