Hello, I am Betty Lopez.
user
Hello, How could I serve you today?
assistant
 Owing to an emergency, I want to change my reservation.
user
Sure, I am happy to help you. Wait for few minutes, I will check with your existing reservation.
assistant
Ok.
user
Thank you for waiting, There is no existing reservation found on your name.
assistant
Ok, not an issue.
user
Thank you for opting us, Have a good day.
assistant