When the someone "Confirms" their availability for a scheduled role, either by confirming via the "confirm" button on the schedule (next to the name) or via the link in the Service Reminder, there should be a e-mail sent to the person with their confirmation notice... something like
"Your availability to attend as -role- on -service date and time- has been confirmed. Thank you for your for serving -church name-. Please check back to the website for any details on this service by clicking -service link- etc..."