"Phone, I need to let my wife know I can't pick up billy after karate tonight and not to wait for me for dinner. Also confirm my appointment Thursday with Edward Jensen and cancel my appointment Friday with Esther. Also remind me I need to pick up some milk at the store on the way home and pick up a prescription as well."
From this your phone sends a text to your wife telling her "I can't pick Billy up from Karate and do not wait for me for dinner." It will then go in your calender and check your Thursday appointment with Edward Jensen and send him and you a confirmation email. It will also check your calendar for Friday and send a cancellation request to Esther and make a note of that in the calendar. As you get near the store on your way home your phone will signal an alarm and alert you to go to the store and to pick up milk and your prescription.
I understand it is possible YOU would find no use for that kind of service, but I can assure you a lot of people would.
Can you at least understand how this is significantly different then search voice commands?
Wishful thinking. We'll have flying cars before a proper working voice recognition and AI system.