Need advise on the rules of male/female interaction in Egypt

As you know I recently moved to Cairo.  One thing I do not understand yet is the male/female interaction.  Egyptian men and women are flirty, lively, and very friendly.  So, how does one know if the guy is just friendly, or if he is “interested”?  When is the question “do you want to hang out?” just a friendly question and when is it a statement of interest.  Also, how will my response demonstrate either friendship or interest?