Approving Bookings

When a customer uses the front-end, we have to go to back-end to “Approve” bookings. On testing, it appears that when we select “Approve”, the user doesn’t get an email to confirm that we can do this. Is there a setting I need to toggle to ensure that an email can be sent to Confirm that we’ve approved the booking or do we need to reply individually to the email address of the booking.