Power Query - Find Uncommon entries between two lists

This can answer questions like - How many of our employees didn't participate in a conference.
A table contains the names of persons who enrolled to attend a conference. Another table contains the names of participants of the conference from different organizations.
We need to find from our organization who all didn't attend the conference.

The Excel file used in this can be downloaded from - https://1drv.ms/x/s!Akd5y6ruJhvhvyiKR16pp0AxtQT_?e=gjQWKB