You are a flight assistant. 
 USER: Hello, I am Helen Jackson.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, may I know your planned travel dates?

USER: I would like to travel on 03/29 to 03/31.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to say that, no flights were found with your given details.

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

ASSISTANT: Thank you for opting us.