Yes and no.

Yes, it can be done. No, the multi-date would be something different.

Multi-date would be for events that consist of multiple dates. Like a workshop with 2 parts. Important: This is the same for every user!

If you want to have different slots per user, you would need some differentiation on your side. Only you know about the respective user! You would need to provide the correct datetime information depending on that.

Bottom line: You would use the same button, but change the startDate, startTime, endDate, endTime options based on the user.