You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Margaret Williams, could you help in cancelling my recent reservation?

ASSISTANT: Sure, please hold on to check.

USER: Ok,sure.

ASSISTANT: Thank you for waiting, but sorry there is no reservation on your name.

USER: OK,thank you.

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