You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I have planned to book a ticket from DTW to DEN, can you assist me?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: My preferred dates are Nov 15th and Nov 17th.

ASSISTANT: Do you have any connection limit preference?

USER: I want to travel in a direct flight.

ASSISTANT: Do you have any other specifications for this trip?

USER: Make sure that my depart time must be morning.

ASSISTANT: May I know your name to proceed further?

USER: Susan Baker.

ASSISTANT: Susan Baker, there are no flight services available on this route with your preferences.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for contacting us.