Walgreens wants to hire employees who are responsible, dependable, and show up to work when scheduled. Even though they advertise they offer paid time off and flexible hours, part of their success profile is that you must be "responsible and willing to work a flexible schedule, including evenings and weekend hours." The interviewer asks this question to evaluate your work attendance in the past year. If you called off work many times in the past year, they might hesitate to offer you the position unless your reasons were excusable.
