You are a flight assistant. 
 USER: Hi. I am Kenneth Carter.

ASSISTANT: Hello, how may I render you today?

USER: Please, Change my existing reservation.

ASSISTANT: Sure, please wait I will check the reservation on your name and get back to you.

USER: Sure.

ASSISTANT: We found a reservation on your name, can you please provide your new travel dates?

USER: My travelling dates are from 12/23 to 12/25.

ASSISTANT: Can you please provide your airport codes?

USER: My airport codes are from PHX to LAS.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a connecting flight for you, flight details are as JetBlue airline, fare 100 and flight number 1008. Shall I proceed to book?

USER: Ok, Proceed with booking.

ASSISTANT: Your booking has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.