I only book lessons via email. I use Gmail and when we are going back and forth arranging a time please stay within the email thread. Don't reply with a new email. I teach 7 days a week and typically have 10:30, 12:00, 1:30, and 4:30 slots available. When I have open spaces I am trying to fill, I will offer those same slots to different clients. The first person to get back to me can have that available slot.