How did Lahcen try to help Aziz get jobs in Chapter 4?

Lahcen tried to help Aziz get jobs. He took Aziz to the office of a dentist who had a chair that did not work. They sat in the waiting room a long time. When the office was closing, Aziz took at look at the chair. A button had just needed to be turned on. The dentist gave Aziz ten dirhams. Aziz thanked Lahcen for trying, but he told him that the dentist would never recommend him to anyone because the dentist would have to admit his mistake.