You can check the service intervals on the Audi site, but it am sure it was just an oil change. The big one is at 55,000 miles. Depending on the age of the car, The cabin air filter might need to be changed as well as the engine airfilter.
2006 Black A4 quattro 2.0t FSI 6sd man
2015 Monsoon Gray Metallic Audi Allroad