You don't need to look out for AOIs they are affirmative statements (Affirmative/Negative i.e. Yes/No) that should give clearer feedback than IOIs.

If you ask a girl for her number and she says 'No' There you go, nothing to look out for. The information is there clear as day....move on. No time wasting, deliberating or self-doubt in your head about percieved IOIs.