You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am William Miller. Due to some personal issues, I would like to cancel my reservation.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name. Thank you for contacting us.

USER: Its ok. Thank you.

ASSISTANT: Have a nice day.