Hello.
user
Hello, how may I help you?
assistant
I want to change my existing reservation, due to some work at my office.
user
Sure, we are here to help you. May I know your name please?
assistant
I am Margaret Clark.
user
Sorry to inform you that there is no active reservation on your given name.
assistant
Ok, Thank you for your service.
user
Thank you for contacting us.
assistant