You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Scott Lopez want to change my existing reservation due to cancel of my magic show.

ASSISTANT: Sure, please wait for a while, I will check the availability of reservation on your name and revert you.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry to inform you that there is no reservation found on your name.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.