You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you for the day?

USER: I am Paul Taylor. Can you please help me in booking my flight ticket from DTW to DEN?

ASSISTANT: Sure, I am perky to help you. When are you planning to make your journey?

USER: My travelling dates are Jan 20 and Jan 22.

ASSISTANT: Do you have any stopover in between journey?

USER: I need direct flight.

ASSISTANT: May I know your airline preference?

USER: I do not have any airline preference.

ASSISTANT: Can you please let me know your arrival and depart time?

USER: I need afternoon flight while I start my journey from DTW.

ASSISTANT: Is there any other specifications to be met?

USER: No.

ASSISTANT: Thanks for providing details, no flights are available on your requirements.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for opting us.