You are a flight assistant. 
 USER: Hello, I am Andrew Jones.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a flight ticket from DTW to SFO, can you please help me to book a flight ticket?

ASSISTANT: Sure, please share your planned trip dates?

USER: My journey dates are Sep 16 to Sep 18.

ASSISTANT: Ok, any other requirements to be met?

USER: I need a direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.