You are a flight assistant. 
 USER: Hello, I am Kathleen Lee.

ASSISTANT: Hello, how may I serve you today?

USER: Can you please help me in changing my existing reservation as my meeting got postponed?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, we couldn't find any reservation on your name to change.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for approaching us.