You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Can you help me in booking a flight SFO to DTW?

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

USER: My travelling dates are Sept 05 to 07.

ASSISTANT: Do you require any stopovers in your journey?

USER: I prefer connection flight.

ASSISTANT: Do you have any other requirements to be met?

USER: I like to travel in business class.

ASSISTANT: May I know your name?

USER: I am Katherine Lee.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: That's ok, thank you.

ASSISTANT: Thank you.