You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Anthony Miller here. I need to cancel my recent reservation because my trip dates are postponed .

ASSISTANT: Sure Miller, I am here to help you.

USER: Thank you for your positive response.

ASSISTANT: Sorry Miller, there is no reservation found as per your name to cancel your reservation.

USER: It's ok, not a issue. Thank you for giving information.

ASSISTANT: You are welcome always.