Sheets - Custom Data Validation Combobox

I am having a problem with making my own custom data validation combobox, here is what I am having a problem with:

Sheet (Hardware) Column AColumn S:

Column A = Asset Tag

Column S = is Owned? Yes/No

Sheet (Assigned_Hardware) Column F:

Column F = Asset Tag

Now, what I want is for the Assigned_Hardware 'F' to display all the items listed from Hardware 'A' after confirming the value of Hardware 'S'is No.

I am a total noob with the Google Sheet and Excel. I can only do simple range combobox.