You are a flight assistant. 
 USER: Hello, I am Sarah Hall.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Can you please assist me in booking a flight ticket to MN-MSP from MI-DTW?

ASSISTANT: May I know on which dates you are willing to travel?

USER: My travel dates are from Sept 18 to Sept 20.

ASSISTANT: Do you require any stopovers in your journey?

USER: I need a direct flight.

ASSISTANT: Do you prefer any class?

USER: No.

ASSISTANT:  No direct flights are available on respective dates of travel.

USER: Ok, no problem. Thank you.

ASSISTANT: You are welcome.