If you want to say that you're not busy, then you should use "frei haben" instead of "frei sein" https://german.stackexchange.com/questions/22528/ich-habe-frei-vs-frei-habe-ich-vs-ich-bin-frei-vs-frei-bin-ich
'are you liberal SHOULD be accepted. we use it here in malta'
This in not exactly proper English & would not be understood (the listeners might think you asking about their political views).
Liberal: English adj -> 'open to new behavior or opinions and willing to discard traditional values'