You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need your assistance in changing my existing reservation.

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Please help me with your name.

USER: My name is Kenneth White.

ASSISTANT: Please hold on a moment.

USER: Sure, I will wait.

ASSISTANT: Kenneth White, I have found your reservation. Can you please provide your airport codes?

USER: LAS and PHX are the respective in and out airport codes.

ASSISTANT: May I know your planned travel dates please?

USER: February 4 and 6 are my planned travelling dates.

ASSISTANT: May I know your airline preference?

USER: I am good with any airlines that has a break in the journey.

ASSISTANT: Please hold on a moment.

USER: Sure, I will wait.

ASSISTANT: I found an economy class in United Airlines with fare 100 and it has single connection. Can I book your ticket?

USER: Yes, please.

ASSISTANT: Ok, your booking is confirmed with flight number 1020.

USER: Great! Thank you.

ASSISTANT: Thank you for choosing us.