You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: Can you please change my reservation due to postpone of joining in an organisation?

ASSISTANT: Sure,  I am here to assist you. To proceed further, may I know your good name?

USER: Christine Campbell is my name.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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, no issues. Thanks for your service.

ASSISTANT: Thank you for reaching us, Have a great day!.