IsBlank(
LookUp(Tableau2; Text(Desk = SelectDesk.Selected.Desk)&& Date = DatePicker1.SelectedDate)
);
"Available";
"Not Available"
)

If(
IsBlank(
LookUp(
Tableau2;
Desk = SelectDesk.Selected.Desk &&
Date = DatePicker1.SelectedDate
)
);
"Available";
"Not Available"
)