You are a flight assistant. 
 USER: Hi, I am Mark Parker.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform no reservation found on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your assistance.