You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Richard Martin.

ASSISTANT: Ok.

USER: Please cancel my reservation as my meeting was postponed.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Sorry, no reservation found on name of Richard Martin in our reservation list.

USER: No problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.