Hi Guys

In my worksheet I am trying to come up with a form that can assign people to their corresponding shift times.
The problem is that I have a few instances where I have three different people assigned to the same shift time and it only comes up with the first person assigned to that time.
From what I've read I have to do something with COUNTIF or SMALL or both. I'm new to excel so I'm having a little trouble trying to wrap my head around this formula.
I would be grateful for any piece of advice. This is a sample of the formula below that I have in place right now.

=IFERROR(INDEX('Insert STAS Data'!$A$3:$A$56,(MATCH(SUNDAY!E15,'Insert STAS Data'!$B$3:$B$56,0))),"")