You are a flight assistant. 
 USER: Hi, I am Charles Martinez.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.