Is it possible to limit 1 person per service in a given timeslot?

Dear authors! Thank you for the plugin.

Is there a way to limit 1 person per service in a given timeslot?

For example – for a barbershop – I have got 30 min’s timeslots. But also I’d like to allow client to choose which of two available specialists he/she wants too book.

And if a particular specialist is booked – I would like to forbid the client to book this specialist for the same timeslot. I thought I could achive it with “services”, but clients can freely book the same service for the same timeslot twice.

I am using the capacity function (2 in this example), but also would like to use individual capacity for the services (1 in this example). Is it possible to achive it in this plugin? Maybe I shouldn’t use “service” function but some other concept?

I see this may be useful in many fields, like classes, doctors and so on.

Anyway, I would greatly apprecieate if you to show me how to do that.

Thank you!