Hello, I am Timothy Nelson.
user
Hello, how can I help you today?
assistant
I would like to alter my reservation as my exam scheduled has been postponed. Could you help me in changing?
user
Sure, I will help you. Please wait a moment.
assistant
Ok.
user
Sorry, there is no existing reservation found on your name.
assistant
Ok, no worries at all. Thank you for your service.
user
Thank you for choosing us.
assistant