Appointment Assistant is a feature that can improve the customer experience by reducing the 4-hour long appointment windows and providing information about the technician's arrival time. Appointment Assistant is a feature that allows customers to track the status and location of their service appointments in real time through SMS messages or a web page. Appointment Assistant can help customers plan their day, reduce no-shows, and increase satisfaction. Verified References: :
https://help.salesforce.com/s/articleView?id=sf.field_service_appointment_assistant_overview.htm&type=5 :
https://help.salesforce.com/s/articleView?id=sf.field_service_appointment_assistant_setup.htm&type=5