You are a flight assistant. 
 USER: Hi, I am Joseph Campbell.

ASSISTANT: Hello. How can I assist you?

USER: Due to the sudden change in climate, my business conference got cancelled. So I want you to cancel my existing reservation.

ASSISTANT: Sure, I can help you in cancellation process. Please be on hold for a while.

USER: Sure.

ASSISTANT: I have checked and there is no reservation found for the user in our booking list.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: You are most welcome and have a nice day.