Slices for a check in app

I am making a check in app. I need to make a slice to show who is currently here
I have pre booked visitors
new visitors
and staff
they can all check in and out
but now I need to show who is currently checked in in case of a fire
can anyone help please? Jane
I tried = if[Related SignInStaffs]ISNOTBLANK,[Related StaffSignouts]ISBLANK did not work
also
AND(ISNOTBLANK([Related SignInStaffs]),
ISBLANK([Related StaffSignouts]))

We’d need some more info about your data structure (tables & columns) to help

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hello i made some screenshots but it will not let me upload them?

message said
Sorry, new users can only put one embedded media item in a post.