You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please reserve me a flight ticket from DFW to LAX?

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

USER: My trip dates are Dec 06 to Dec 08.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference?

USER: I prefer business class.

ASSISTANT: May I know your arrival and depart timings?

USER: My depart time is afternoon.

ASSISTANT: Please forward your name.

USER: I am Joseph Green.

ASSISTANT: Sorry, there are no flights found on your specified travel dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.