You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am William Gonzalez. I want to book a flight ticket from ATL to OAK. Could you help me in booking?

ASSISTANT: Sure, can you please share your planned travel dates?

USER: My travelling dates are from Dec 24-26.

ASSISTANT: Do you want connecting flight?

USER: Yes.

ASSISTANT: May I know your depart time?

USER: My depart time should be in the afternoon.

ASSISTANT: Do you have any other requirements?

USER: My return time should be in the morning.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.