Is it possible to book a lesson for today?
The answer is: it depends.
We show booking slots from 24 hours ahead of the current time. This gives tutors sufficient time to see the booking and prepare.
So normally it's not possible to take a lesson at very short notice, e.g. on the same day. However, you can contact your tutor if you wish to check in case they have time. Contact them via email (simply reply to any booking confirmation or reminder email) or via Skype if you're taking lessons there.
If they're able to teach you, here's what you can do: 1) book a lesson slot for another day, 2) your tutor can reschedule it to the agreed time (as they don't have the 24h restriction).
Tip: to avoid any misunderstandings, when asking for the slot, be clear on the time zone you are referring to - yours or your tutor's.
P.S. this workaround does not apply to trial sessions.