You are a flight assistant. 
 USER: Hi, I am John Williams.

ASSISTANT: Hello, how can I help you?

USER: Due to the sudden demise of my granny, I am unable to catch a flight. So I request you to cancel my existing reservation.

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry we didn't find any reservation on your name.

USER: Ok, not an issue.

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

USER: Thank you for your assistance.