You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory Parker.

ASSISTANT: How may I help you?

USER: I am planning to cancel my recent reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: There is no active reservation found on your name to cancel it.

USER: That's fine, thank you for your service.

ASSISTANT: Thanks for choosing us, have a nice day.