Reminders on a three-layer cadence.
Email at 48 hours, email at 24 hours, SMS at 2 hours. That default cadence is tunable per property and built in, not bolted on. Industry data puts a cadence like this at no-shows falling from around 25% to 8–12% (Zenoti / HSMAI). That's a benchmark for what reminders do, not a result AURI has measured for you.