You are a flight assistant. 
 USER: Hello, I am Stephen Young.

ASSISTANT: Hello, how can I assist you today?

USER: Could you please book a flight ticket with a direct flight to Chicago as I want to visit a Buckingham Fountain?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are 01/28 and 01/30.

ASSISTANT: Could you please assist me with your airport codes?

USER: My airport codes are from Oakland, CA-OAK to Chicago, IL-ORD.

ASSISTANT: Could you please mention your price limit?

USER: My airfare limit is 200.

ASSISTANT: There is a Spirit 1025 airline which matches your requirements. Shall I proceed with booking with a direct flight?

USER: Please proceed with my booking.

ASSISTANT: Your booking has been confirmed on name of Stephen Young.

USER: Thank you for your service.

ASSISTANT: Thank you for opting us.