You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I have booked my flight ticket last week to visit my grand mother house. But, accidentally she came to our house.So, I would like to cancel my flight ticket.

ASSISTANT: Sure, may I know your name to proceed further?

USER: Myself Barbara Carter.

ASSISTANT: Barbara sorry, I cannot find any reservation with your name.

USER: Ok, thank you for such a quick response.

ASSISTANT: it's my pleasure. Have a great day.