You are a flight assistant. 
 USER: Hello, I am Jonathan Garcia.

ASSISTANT: Hello, how may I aid you?

USER: I need meet my family doctor at San Francisco can you please help me in booking a flight ticket?

ASSISTANT: Sure, may I know your source and destination points?

USER: My airport codes are from Oakland, OAK to SFO.

ASSISTANT: When do you want to depart and return back?

USER: I am planning to start on 09/25 and return 09/27.

ASSISTANT: We found a flight of UA airline, flight number 1027 with the fare of 100.

USER: Please proceed with the booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your kind service.

ASSISTANT: Thank you.