I do some sales meetings with usually IT people and facility directors in local schools, etc. I usually go with just my boss, who is a older man. The people we meet with tend to address him, though I will chime in and take over at any opportunity I have - I have been on quite a few of these meetings and am as assertive as I can politely be. My boss tends to get off topic and be repetitive and forget to mention some of our key sales points, and sometimes the conversation may wander without me being able to get these points in.
The problem may be any combination of my boss taking over my opportunities, or those that we meet with addressing him instead of me.
As a young woman, how can I appear more professional and assertive during a meeting?