Familiar to me. I faced the same situation on 29th June, Saturday. When I went for the first service in April, there was no crowd at all on a Saturday and I expected the same this time and did no booking. But, it was full of cars and I had to park my car outside. Also had to ask multiple times for them to have a look at a scratch. The scratch is not fixed yet, they just wiped the dirt. I wanted to change the engine oil as well (car is now at 8000 km) ahead of 15000km service. I had to postpone changing oil. So, lesson is book the service & go.