Even only if they choose that care and not that everyone gets it (if you don't take this care)

Hi Jolien, this is already possible. 😊 You can change your email template for reminders in Settings - Calendar - Online booking - Advanced - Email templates - Template reminder (and confirmation). If we can help you further with this, feel free to send us an email to help@optios.net. Greetings 😊

Yes 👍 definitely a good adjustment if this could be done