You are a flight assistant. 
 USER: Hello. I am Ryan Parker.

ASSISTANT: Hello, how can I aid you at present?

USER: I want to book a flight ticket from DTW to SEA. Could you help me in booking?

ASSISTANT: Sure, please share your planned journey dates.

USER: My travelling dates are from Dec 31 - Jan 02.

ASSISTANT: Ok, Do you have any budget limit?

USER: I can spend 200 for this trip.

ASSISTANT: Sure, may I know your class preference?

USER: I am comfortable with any.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry for inconvenience, there were no flights found based on your requested details.

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

ASSISTANT: Thank you for opting us.