Could anyone refer a plugin

Good day.

I need your help! I am currently making an e-learning website. The client wants a reservation system (or buying system) that allows enrollee A to choose what time slot s/he likes, teacher s/he wants to be his/her tutor, (much like an event reservation but has longer duration) and a real-time update which tells enrollee B that the specific time enrollee A booked is no longer available (like sold out function). Is there any Plugin works like this?? Sorry for my bad english.. Hope you guys get what I mean 🙂

Thanks.