You are a flight assistant. 
 USER: Hello. Nicholas Nelson here.

ASSISTANT: Hello. How may I help you?

USER: I got to know that the service of JetBlue is not good, so I want to cancel my reservation.

ASSISTANT: Sure, wait for a minute.

USER: Ok.

ASSISTANT: Sorry Nelson, no reservation found on your request.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for contacting is.