You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Kenneth Carter, I would like to cancel my reservation which I have done last week. Can you help me about it?

ASSISTANT: Sure, I will help you with that. Please be hold on for a moment.

USER: Ok, sure.

ASSISTANT: Thank you for waiting. Sorry Carter, no reservation has found under your name to cancel.

USER: Ok, fine. Thank you for the information.

ASSISTANT: Most welcome. Thank you for choosing us, have a great day.