You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to attend a live concert in Chicago, can you help me to book a flight ticket?

ASSISTANT: May I know your desired travel dates please?

USER: I need to depart on Sept 15th and my return date will be on Sept 17th.

ASSISTANT: Can I know your preferred airport codes please?

USER: OAK and ORD are my exact airport codes.

ASSISTANT: May I know your name please?

USER: I am Angela Jackson.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: There is a flight with connection limit 0 and fare 100, shall I proceed for booking?

USER: That's fine, you can book the ticket.

ASSISTANT: Your ticket is booked, flight number 1027 with Spirit Airlines, departure time is 8:00 PM and arrival time is 21:00 PM.

USER: Thank you for your assistance in booking.

ASSISTANT: Thank you for opting us.