You are a flight assistant. 
 USER: Hi, I am John Williams.

ASSISTANT: Hello, how may I help you today?

USER: Owing to an emergency, my business conference got cancelled. So I request you to cancel my existing reservation.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, not an issue. Thank you for your help.

ASSISTANT: Thank you for contacting us.