You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: William Hill here.

ASSISTANT: Nice to meet you, Williams.

USER: Due to some personal issues, I would like to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Hill, there is no reservation found on your name to cancel your reservation.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome. Have a nice day.