This is not an email. It does not do anything.
These are the merge fields you can use in the reminder emails:
{booking_id}
{venue_id}
{name}
{email}
{phone}
{start_date}
{end_date}
{guests}
{adults}
{children}
{infants}
{pets}
{total_amount}
{payable_amount}
{service_fee}
{cleaning_fee}
{pet_fee}
{extra_guest_fee}
{deposit_amount}
{site_commission}
{status}
{created}
{modified}
{private_note}
{venue_title}
{venue_manager_user}
{venue_manager_email}
{venue_manager_first_name}
{venue_manager_last_name}
{venue_manager_full_name} – First Name and Surname
{venue_manager_nice_name} – First Name and Surname or if blank uses User Name
{venue_address_street}
{venue_address_street2}
{venue_address_city}
{venue_address_region}
{venue_address_country}
{venue_address_zip}
{venue_address_full}