You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am Margaret Robinson. I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: There is a reservation found under your name to change it, can you please mention with your dates of journey?

USER: My travelling dates are from Sep 22-24.

ASSISTANT: Ok, may I know your respective airports codes of journey?

USER: My airport codes are PHX - LAX.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: I found a flight with the connecting flight of fare 100 with Frontier airline, are you ok with this booking?

USER: Yes, please proceed.

ASSISTANT: Ok, I have reserved your ticket with the flight number 1010.

USER: Thank you.

ASSISTANT: You are welcome, have a safe journey.