How do I make the tint in the windows darker? I keep using Material called 'black' but it doesn't have any reflection....

I keep trying to make a window darker or have darker tint...

Not sure which material to use.... I chose black because it gives the amount of tint I want but it's flat and doesn't look much like a window (there's no reflection).

Is there a better way to tint and make a window very dark?