Tickets were technicians have unassigned themselves

Tickets were technicians have unassigned themselves

Is it possible to produce a report to show where tickets that are assigned have been "unassigned" and put back into the queue for someone else to pickup?

For example, in a ticket history, it may say something similar to this:

Request Updated by John Smith
Technician changed from John Smith to None

I need to report on all such tickets.

Thanks.

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