If you are taking the time to be with someone, BE with them.
Give them your attention.
Stop texting on your cellphone. Stop talking on the phone. Make eye contact. Show respect by engaging with the person who is giving you their time. Make sure the people in your meeting know that they are more important than the latest sport score that just came through on your cellphone. If you are expecting an urgent call that you must take, make this clear at the outset.