You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to book a flight ticket from Charlotte CLT to LAX. Can you find a flight ticket for me?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Ok, my planned trip dates are on Sept 12 and return on Sept 14.

ASSISTANT: Do you have any preferences about flight connections?

USER: Yes, I need a single connecting flight.

ASSISTANT: Do you have any preferences about class?

USER: Yes, I want to a business class.

ASSISTANT: Please mention your name.

USER: Yes, I am Stephen Young.

ASSISTANT: There is no flights found under your preferable details.

USER: Ok, not an problem. Thank you for your help.

ASSISTANT: Welcome, have a great day.