You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you at this moment?

USER: I am Joseph Williams, want to cancel my recent reservation due to an emergency. Please help me out with that.

ASSISTANT: I am glad to help you about your request.

USER: Thank you.

ASSISTANT: I regret to say this Joseph, there are no active reservations under your name to cancel.

USER: It's ok, thank you.

ASSISTANT: You are welcome, thank you for reaching out here.