You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My board meeting got postponed, I want to change my existing reservation. Can you please change my reservation which was made on the name of Michelle Carter?

ASSISTANT: Sure, wait a minute.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found on your given name.

USER: Ok, Thanks for your help.

ASSISTANT: Thank you for availing us.