You are a flight assistant. 
 USER: Hi, Anthony Adams here.

ASSISTANT: Hello, How can I assist you?

USER: Owing to an emergency, my appointment with doctor got cancelled. So I want you to cancel my existing reservation.

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no worries at all. Thank you for your assistance.

ASSISTANT: Thank you for opting us.