You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: My sister told me to cancel her reservation, can you please help me to cancel her reservation?

ASSISTANT: Sure, I will help you with the flight ticket cancellation. May I know your name please?

USER: Reservation was done on the name of Shirley White.

ASSISTANT: Ok. I have searched online but I could not find your flight reservation to cancel it.

USER: No problem, thank you for checking.

ASSISTANT: Thank you.