You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to sudden change of my plans, I need to cancel my tickets, can you please help me with it?

ASSISTANT: Sure, for cancellation it is mandatory to know your name.

USER: Sure, I am Carol Hill.

ASSISTANT: Ok, hold on for a moment.

USER: Ok, I will be waiting.

ASSISTANT: Sorry Carol, there are no flight reservation found on your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us. Have a good day.