Hi Bjorn, I've used the registrants details report for something like this. If you go to report templates --> registrants --> registrant details. On this report you can add each session as it's own column so you could add each of your 4 sessions as a column that has Yes/No values and that way you only have one row per registrant.
To further dive into your requirements you can add advanced filters in change report data and your selection criteria tab for breakouts.
Breakout One Name = Yes
Breakout Two Name = Yes
This way you only have rows for registrants who have RSVP'ed for one of those sessions you had in mind for that day and you can add the columns for the sessions so the sales team can see which ones people are attending during that day. The only limitation is you can only add 5 advanced filters to a report at once. So if you have more than 5 you might be stuck doing some sorting manually in excel but shouldn't take long.