You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I want to cancel my existing reservation.

ASSISTANT: Sure, can I have your name please?

USER: I am Gary Rodriguez.

ASSISTANT: OK, can you please hold on a moment, I will get back you. Thanks for waiting.

USER: OK.

ASSISTANT: We are sorry to say you that we have not found any reservation on your given name.

USER: Thanks for your prompt service.

ASSISTANT: Thank you for choosing us, have a great day ahead.