You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Jason Davis.

ASSISTANT: Jason Davis, how may I assist you today?

USER: I am looking to book a flight ticket to meet my friend in Oakland, can you help me for booking a flight ticket from LAX to OAK?

ASSISTANT: Sure, I will help you. Please let me know with your planned travel dates.

USER: My travelling dates are Sep 13 and Sep 15.

ASSISTANT: Jason Davis, do you need a direct or connecting flight?

USER: I need a single connecting flight.

ASSISTANT: Jason Davis, I really regret to inform you that there are no flights available with respect to your preferences.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for understanding.

USER: Welcome.

ASSISTANT: Thank you for reaching us. Have a great time.