From a conversation, propose a Quest Call: pick a Quest, a time and a duration. Times snap to a 15-minute grid, and your match sees every time in their own timezone.
Your match can accept or decline, and you can withdraw a proposal you sent. A proposal stays open for up to 48 hours before it quietly expires; accepting books the call for you both. Reminders arrive ahead of a confirmed call: a day before, an hour before, 30 minutes before, and a final nudge minutes before that takes you straight to the room. Plans change, so either of you can cancel a booked call before it starts, and the other soul is told.
You can also set your general availability so proposals land at times that suit you. Bookings go up to 45 days ahead.