Hello, I am Catherine Thomas.
Hello, how may I provide assistance for you?
Due to an emergency meeting, I want to change my reservation.
Ok.
Can you help me with it?
Sure, I will help you. Give me  a minute, I will serach a  reservation on your name and let you know the status.
OK.
Thanks for your time. There is no reservation found on your name.
Np problem, thank you for the information.
Thank you for availing us.