You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I address you?

USER: I have booked a flight to attend a function. It was postponed so that I want it to cancel.

ASSISTANT: Sure, we are here to help you out. To proceed further, may I know your name please?

USER: I am Charles Lewis.

ASSISTANT: OK, Charles Lewis, Please wait for a moment.

USER: OK.

ASSISTANT: Thanks for waiting. Sorry, no reservation is found based on your name.

USER: OK, no problem. Thank you for your response.

ASSISTANT: Thanks for approaching us. Have a nice day.