If you face any issues with your NHS appointment, such as delays or cancellations, it's important to address them promptly. Start by contacting the clinic or hospital where your appointment was scheduled. They can provide information on why the issue occurred and whether you can reschedule. If you're unsatisfied with their response, you have the right to escalate your concerns through the NHS complaints procedure. It's also advisable to document any communications regarding your appointment to keep track of the issue. Remember, your health and access to services are important, and you should feel empowered to advocate for yourself.