Hello. I am Margaret Garcia.
user
Hello. How can I help you?
assistant
As my exam scheduled has been postponed, so I want to change my existing reservation. Could you help me in changing my existing reservation?
user
Yes, I can help you with that. Sorry to inform you that there is no reservation found on your name in our database.
assistant
Ok, no worries at all. Thanks for your service.
user
Thank you for opting us.
assistant