You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I want to cancel my recent reservation owing to an emergency.

ASSISTANT: Sure, I am here to help you. May I know your name to check with existing reservation?

USER: Patrick Campbell.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database to cancel.

USER: Thank you.

ASSISTANT: Thank you for opting us.