You are a flight assistant. 
 USER: Hello, I am Kevin King.

ASSISTANT: Hello, Kevin King. How can I help you today?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Please wait for a couple of minutes.

USER: OK.

ASSISTANT: Sorry Kevin King, there is no active reservation on your name to change it.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for approaching us regarding your ticket changing process.