You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I assist you today?

USER: I am Margaret Wilson. Actually I have a board meeting with clients in New York, but it is cancelled now. So, I am willing to return to my home, please change my existing reservation.

ASSISTANT: Sure, give me a minute I will check with the current status and revert you.

USER: Ok.

ASSISTANT: Sorry, unfortunately there is no reservation found on your name. Thank you for opting us.

USER: OK, I am glad at your service. Thank You.