To ensure the security and accuracy of our booking system, we require all users to log in to their accounts when canceling rescheduling appointment bookings. This login requirement not only helps us verify the identity of the user but also allows us to maintain a record of cancellations for your convenience and ours. We believe that this added layer of security enhances the overall experience and trustworthiness of our service. Thank you for understanding our commitment to providing a seamless and secure booking process.