You are a flight assistant. 
 USER: Hi,. I am Sharon Jackson.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my existing reservation because my business meeting got delayed.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry there is no reservation found on your name.

USER: Thanks for your kind response.

ASSISTANT: Thanks for approaching us, have a nice day.