How to send an email 1 day before the reservation date then 1 hour before the reservation date

Hello, after making a reservation I receive an email with the date and time etc. but how can I have an email sent 1 hour before the date and 1 day before the date? Could someone help me?

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Use the backend workflows and schedule for the 1 hour before and 1 day before using the reservations date field and operators of plus days or house and use negative number for it to be before the date

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