The conversation between A and B, as well as motorcycles, shows that they all like to show off, people, sometimes in front of you.
Motorcycles become cars, they help you, and your sister looks after you. This means that you want to have face in front of them, live a better life and have more status than them.
The second dream, wearing slippers, shows that you are negligent and let the boss criticize you.
Combined with the first dream, the second dream is more likely to be reality, and the first dream is ideal, returning from ideal to reality.