You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help that you need from my end?

USER: Actually my Snooker's competition is postponed, so that I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, I can help you and can I know your name for checking purpose?

USER: Thank you for accepting my request. I am Betty Walker.

ASSISTANT: Please allow me a moment.

USER: Sure, I will wait.

ASSISTANT:  Thank you for waiting, I have checked in reservation list to change your ticket but could not find any reservation with your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: You are most welcome and have a nice day.