You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am planning to book a flight ticket to ATL from OAK, can you please help me out?

ASSISTANT: Sure, can you share your trip dates?

USER: Sure, my planned travelling dates are Dec 26 and Dec 28.

ASSISTANT: Do you have any preferences?

USER: Yes, I am looking for a direct flight.

ASSISTANT: May I know your name?

USER: Sure, my name is David Hill.

ASSISTANT: There is a connecting flight with number 1015 in airline Spirit, the fare is 200 in economy class. Can I book it?

USER: Ok, please proceed.

ASSISTANT: Your ticket is reserved.

USER: Thank you for the help.

ASSISTANT: Thank you for opting us.