Ticket/Request should not be closed or delete without assigning to the technician

Ticket/Request should not be closed or delete without assigning to the technician

Hi All,
I have one requirement.

I am based on IT group. I am able to view all IT related tickets/request.

My requirement is "Without assigning to technician, any ticket should not be closed/delete. Basically I need restriction".

Any Idea.. Please share

                  New to ADSelfService Plus?