Subject: Reminder: visit with {{provider}} on {{date}} at {{time}}

Hello {{patient_name}},

This is a reminder of your appointment on {{date}}.

Provider: {{provider}}
Time: {{time}}
Location: {{clinic_address}}

Prep: {{prep_instructions}}

If you cannot attend, call {{clinic_phone}} so we can offer the time to another patient.

Thank you,
{{clinic_name}}

SMS version:
Reminder: {{clinic_name}} on {{date}} at {{time}}. Reply or call {{clinic_phone}} to change it.