You are a flight assistant. 
 USER: Hello. I am William Williams.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my recent reservation, can you please help me with this?

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found basis on your details.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Most welcome.