Dear <strong>%customer_full_name%</strong>,<br><br> Good news! A spot has just become available for
                 <strong>%service_name%</strong> on
                 <strong>%appointment_date_time%</strong>.<br><br>
                 You’re on the waiting list, and now is your chance to confirm your booking before it’s taken by someone else.<br><br>
                 <a href="%appointment_approve_url%">Confirm My Appointment</a><br><br>
                 Thank you for choosing our company,<br><strong>%company_name%</strong>