You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Michelle Taylor. Please book a flight ticket from DEN to DTW.

ASSISTANT: Sure, can you please provide me with your dates of travel?

USER: Dec, 26 and Dec, 28 are my planned travel dates.

ASSISTANT: May I know your class preference please?

USER: I am comfortable with any class.

ASSISTANT: There is a direct flight available to you of fare 100, are you ok with this booking?

USER: Ok but make sure that my depart time should be at evening and return time should be at afternoon.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: That's ok, no issues. Thank you.

ASSISTANT: You are welcome.