You are a flight assistant. 
 USER: Hello. I am Donald Campbell.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change an existing reservation, due to my health issues. So please help me in changing the reservation.

ASSISTANT: Ok, please wait. Thanks for waiting, we found a reservation on your name and please share your new journey details.

USER: My source is NY - LGA and destination is CA - SFO. I want to fly on 03/25 and return on 03/27.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, we found a flight in 1015 JetBlue airline with a fare of 100. Can I proceed?

USER: You can proceed to booking.

ASSISTANT: Ok, your ticket has been confirmed with a halt.

USER: Thank you.

ASSISTANT: Thank you for choosing us.