You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Please help me to book a flight ticket from SFO to LAX.

ASSISTANT: May I know your trip dates?

USER: My travel dates are 28 to 30 of Apr.

ASSISTANT: Do you have any connecting limit preferences?

USER: I need a connecting flight.

ASSISTANT: Is there any other concern?

USER: No.

ASSISTANT: May I know your name please?

USER: I am Debra Wilson.

ASSISTANT: No flights found as per your preferences at the moment.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.