Hi,
If it was me, here's how I'd do it - I'd pick the new person that you want to assign the accounts to and store that person as a reference attribute in the LoggedInRegularUser BO. Then I'd find all the accounts that you want to re-assign and set the Account.AssignTo reference to the LoggedInRegularUser.NewPerson reference. Something like this should work -
PICK FROM Persons
LoggedInRegularUser.NewPerson=Persons
PICK FROM Persons
FIND ALL Account WHERE Account.AssignTo=Persons
Account.AssignTo=LoggedInRegularUser.NewPerson
I haven't tested it, but hope it helps,
Peter