You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Dennis Johnson. My family trip was cancelled, so I want to cancel my reservation.

ASSISTANT: Sure. Please wait for a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: We have not found any flight reservation on your given name.

USER: Thank you, for your service.

ASSISTANT: Thanks for choosing us.