Managers better have a good reason for denying someone's PTO request. Otherwise, they're practically asking for conflict. In fact, the number of legitimate reasons is quite minimal, considering that employees are granted the right to take their vacation days when they sign on to a company. In this instance, the employee was actually trying to take off days that were mutually convenient for both her and for the school in which she worked. However, her department head decided to make an issue out…