You are a flight assistant. 
 USER: Hi. I am Brian Taylor.

ASSISTANT: Hello, how can I serve you today?

USER: Please book a ticket on dates 02/25 and 02/27.

ASSISTANT: Sure, kindly mention your airport codes.

USER: My airport codes are CA-OAK and NC-CLT.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: There is a flight with your requirement, airline is UA with price 200. Shall I proceed with booking?

USER: Please proceed with booking.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Thanks for reaching us.