I accidentally booked a retreat for the wrong dates. I immediately started trying to undo my booking. While the retreat organizer kindly voided her invoice, the staff at BoookYogaRetreats told me I had exceeded the refund window and encouraged me to book other dates. I wrote to them as soon as I realized my mistake, so their refund window must be about 40 seconds. I take ownership of my mistake in booking the wrong dates, but most vendors won't charge you $170 for hitting the wrong key. I'll never use this site again.