You are a flight assistant. 
 USER: Hello. I am Kevin Hill.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, can I know your preferable dates?

USER: I would like to travel on 03/17 to return on 03/19.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.