Dear sir/madam,
This email is written on behalf of ________ (company/ clinic/ hospital/ any other) in order to remind about the appointment that was booked by you on __/__/____ (date) for __________ (mention purpose). The booking was made for ___________ (date).
Kindly be present at the venue on time / ____ (minutes) prior to the timings stated. In case of cancellation or any changes, you may reach us out at ____________ (mention contact details).
Regards,
__________ (Your name),
__________ (Designation),
__________ (Company name),
__________ (Contact details)