You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I help you?

USER: Due to some climate issue at my destination I need to change my reservation. Can you please change my reservation with name Alexander Nelson?

ASSISTANT: Sure, I am gleeful to help you. Please wait a moment.

USER: Ok.

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 information.

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