Simplify the following text for a Grade 12 native English-speaking person.
Original: The customer makes arrangements through the geisha union office ( kenban ) , which keeps each geisha 's schedule and makes her appointments both for entertaining and for training .
Simplified: The clients hire the service of geishas through the Geisha Union Office ( æ ç kenban ) , which takes care of the geisha 's schedule and makes her appointments both for entertaining and for training .