More simply, "Take care, bye".

Is not it a mistake of "mata na"? "kiwotsukete(kiotsukete)" and "mata　na" are used as a set well. Because the meaning of "matta na" is "I waited", cannot be generally the thing using it together. *Please be careful. （気 を つけて/Ki wo tsukete） *See you again! （また な/ｍａｔａ ｎａ） You hope of the safety for the partner, and part. Please use it then.