Hi,.
user
Hello, how may I help you today?
assistant
I am Sandra Martin. I want to change my existing reservation due prepone of my meeting with the client.
user
Ok, please hold on for a minute, I will check the existing reservation and inform you. Thanks for holding on. Sorry to inform you, there is no reservation found with this name.
assistant
Ok, thank you for the information.
user
Have a Great day.
assistant