You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I support you today?

USER: Due to sudden demise of my grand father, so I want cancel my recent reservation.

ASSISTANT: Sure, may I know your name please?

USER: I am Patrick Hill.

ASSISTANT: Ok, Patrick Hill, please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for your time, we are sorry to inform you that no reservation has found based on your name.

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

ASSISTANT: Thank you for choosing us, have a nice day.