The booking system only lets you book up to 24 hours in advance, to avoid people booking last minute while I am busy with another client. I usually have available slots in the evening (6-8 pm Chilean time). If that works for you, book the next available date in the calendar and put in the comment that you would like a sooner booking. I will reply to you and manually update the appointment. Kindly do that only if your situation is really urgent.