Random names to random tasks

Hi,

If have names in column A,Tasks in column B.I have 2 buttons (names & tasks).when i press names btn i would like a random name to appear in column D and for the name to dissappear from Col A.and for tasks btn a random task to appear in column E.

I want this to happen each time i press btns until there is nothing left.

Then in column F i will pick either completed/not completed from dropdown.If cell = completed then task is done and name and task will show yellow fill in columns d,e.

The objective of this is for any name to be given any task randomly.We have to be fair.

Thanks