Copying the responses from the duplicate Facebook post here for everyone:
1- I’m not sure your exact scenario or if this is an option, but I use HubSpot’s scheduler via the meetings tool (just the free version). We created an email for this purpose (because you have to have one for notifications to go to) and rather than the events defaulting to specific users, we just added that calendar to our own (me, really, because I monitor and distribute the events). Again, not sure if that’s helpful in your case but it works nicely for us!
2- If the meeting is assigned based on availability then you cab do it in Hubspot with the round Robin option, if not then just create a virtual user and once meetings are scheduled add one of the two people.