Things get complicated when they don't reset it. As a rule of thumb you should change your oil every 5000 to 7500 miles depending on how you drive your vehicle, short trips, use of E85,..
Any extended oil change interval beyond 8000 miles, you should get an oil change analysis.
From your post you did not mention how many miles did you put in your vehicle since your last oil change. If you drove your Grand Caravan only 1000 miles, you should be fine till you reach 16000 miles.