You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am William Williams. Can you please help me in cancelling my recent reservation?

ASSISTANT: Yes, I can help you.

USER: Ok, thank you.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for consulting us.