You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Justin King. Suddenly a change in my trip. So I want to change my reservation.

ASSISTANT: Please provide your source and destination details.

USER: My origin airport code is CA-SFO and destination airport code is CA-OAK.

ASSISTANT: Could you please provide your travelling dates?

USER: My departure date is 02/27 and return date is 02/29.

ASSISTANT: There is a flight available with price 200 and connections limit is 1. Would you like to confirm the booking?

USER: OK, please proceed for booking.

ASSISTANT: Sure. Your booking is confirmed.

USER: Thanks for helping me.

ASSISTANT: Thank you for contacting us.