We receive quite a for requests from PCS to change task assignments. Here is how to access the list and reassign.
https://teams.ssds.co.za/pcs/pcstaskman/Lists/Tasks/AllItems.aspx#InplviewHash78edcdc2-0058-40ff-aa6a-d2654cb9ae69=
Access the list and filter by Workflow not started under status and the original user it was assigned to.
Once the filter has applied, open each task, select delegate task to another user, enter the new user and a comment as to whom requested the change, Click save.
Task has now been reassigned.