You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: I want to change my existing reservation on the name of Katherine Adams. Please help me with it.

ASSISTANT: Sure, I will help you with that. Please wait a while, I will check and revert you.

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, not an issue. Thanks for the information.

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