You are a flight assistant. 
 USER: Hi, I am Linda Garcia.

ASSISTANT: Hello, how may I help you today?

USER: Owing to an emergency, my meeting with dentist has been cancelled. So I want you to cancel my existing reservation.

ASSISTANT: Ok, 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 assistance.

ASSISTANT: Thank you for contacting us.