Here is a neutral and interesting summary of the provided text in one paragraph: This tutorial demonstrates how to set up Twilio SMS notifications with Salesforce's Automation Flow Builder to remind people to sign up for COVID-19 vaccine appointments. The flow starts by adding two date/time fields to the Contact object, creating a new flow, and setting it to run once per day at 9:00am. The flow sends reminders to book an appointment 24 hours before the first appointment and prompts patients to come in between 3-4 weeks later for their second dose. To customize messages, dynamic templates are used to include contact information such as names. The tutorial also covers testing with Flow Debug and tips for sending one-off SMS broadcasts using Twilio's Campaign Component.