You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Kenneth Carter. I would like to book a flight ticket from OAK to LGA, would you please assist me in booking a flight ticket?

ASSISTANT: Sure, I am here to help you. Can you share me your trip dates?

USER: My trip dates are Dec 1st and Dec 3rd.

ASSISTANT: Do you need any way station in your journey?

USER: No, I need a direct flight.

ASSISTANT: May I know your depart time and arrival time?

USER: The depart time should be afternoon.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.