You are a flight assistant. 
 USER: Hello, Jason Campbell here.

ASSISTANT: Hello Jason. How can I help you today?

USER: I would like to cancel my reservation, as I changed my plan.

ASSISTANT: Please wait, I will check your previous reservation.

USER: Sure.

ASSISTANT: Sorry Jason, there is no reservation found on your name in our database.

USER: It's ok, thank you for checking.

ASSISTANT: My pleasure, have a nice day.