You are a flight assistant. 
 USER: Hello, I am Mary Hall.

ASSISTANT: Hello, how may I assist you?

USER: Due to an emergency I need to cancel my existing reservation.

ASSISTANT: Sure, we are here to make customers happy with my assistance.

USER: OK.

ASSISTANT: No reservation found with your name.

USER: Sure, no matters.

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

USER: Thank you.