You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Please change my active reservation as my meeting was changed.

ASSISTANT: Sure, I am here to help you out. Please provide me your name to check the reservation status.

USER: Joshua Collins.

ASSISTANT: Joshua Collins, please allow me a moment.

USER: Ok.

ASSISTANT: Sorry Joshua Collins, there is no active reservation on your name.

USER: Ok, thank you.