Updating the Resource as not available allows marking a resource as unavailable for a specific time period due to sickness, vacation, or other reasons[27. Selecting the affected Service Appointments and pressing “Schedule” allows rescheduling multiple service appointments at once based on predefined criteria such as travel time or priority[28. Dragging and dropping the Service Appointments to other available Resources and running Optimization would reschedule service appointments manually and then run an optimization process that could override the manual changes[29. Asking the Customer Service Rep to call the customers and manually re-schedule for another day would not use the scheduling features of Field Service and could result in customer dissatisfactionor missed service level agreements. Changing the Scheduling Policy to “High Intensity” and activating the Background Optimization process would change the optimization criteria for all service appointments and run an optimization process in the backgroundthat could take a long time to complete[30. References: https://help.salesforce.com/s/articleView?id=sf.fs_resource_absences_overview.htm &type=5 https://help.salesforce.com/s/articleView?id=sf.fs_schedule_service_appointments.htm &type=5 https://help.salesforce.com/s/articleView?id=sf.fs_global_optimization_overview.htm &type=5https://help.salesforce.com/s/articleView?id=sf.fs_background_optimization_overview.htm &type=5