You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Owing to an emergency, my live concert got cancelled. So I want you to cancel my existing reservation.

ASSISTANT: Sure, please share the name on which you have reserved the ticket.

USER: Sure, Karen Evans here.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We didn't find any reservation on your name.

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

ASSISTANT: Thank you.