I also see another highly rated idea matches this request: "Option: more than one customer can book one timeslot". If combined, this would by far be the most voted for idea.
Our university utilizes the full Office 365 suite and we are limited in using Bookings because we cannot schedule individuals in the same time slot. This feature would save us from having to manage a 3rd party software as we do now for workshops, labs, and exam scheduling.
At the university we would like students to pick testing/practice times, but there can be more than one student for each time slot. Most of the other major booking software have this ability, but we would like to stick with Microsoft as we are in institution using the 365 suite.