You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Owing for an emergency, can you please help me to change my reservation?

ASSISTANT: Sure, please provide your name.

USER: My name is Katherine Taylor.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: I have found your reservation, may I know your airport codes please?

USER: Ok, I want to travel from EWR to PHX.

ASSISTANT: Can you please share your trip dates?

USER: I want to start my journey on 05/21 and return on 05/23.

ASSISTANT: There is a flight for you in Delta airlines with price 100. Can I proceed?

USER: That's good, please book the ticket for me.

ASSISTANT: Ok, your ticket has been booked with flight number 1019.

USER: Thank you very much.

ASSISTANT: Thank you for choosing us.