Hello. I am Helen Smith.
user
Hello, how can I aid you today?
assistant
As my exam date scheduled has been postponed, so I want to change my existing reservation. Could you help me in changing my existing reservation?
user
Sure, please wait a moment.
assistant
Ok.
user
Sorry, there is no existing reservation found on your name.
assistant
Ok, no issues. Thanks for your help.
user
Thank you for choosing us.
assistant