You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you at this moment?

USER: I am John Campbell. Due to my health conditions, I want to cancel my recent reservation. Can you help me with that?

ASSISTANT: Sure, we are here to help you with this.

USER: Thank you.

ASSISTANT: Please hold for a moment, let me check your previous reservation status.

USER: Sure.

ASSISTANT: I am very sorry to inform you that, there is no active reservation found with your name to cancel it.

USER: Ok, not an issues. Thank you for checking.

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