Bus drivers need to be reliable and on time since they are responsible for getting passengers to work, school, appointments, and more. Show the interviewer that you value punctuality and reliability. If you have missed work in the past year, share why you were absent, and the steps that you took to ensure you did not leave your employer hanging. Perhaps you had to take your child to the hospital, and you called to explain the situation rather than just not showing up.
Situations happen from time to time, and the hiring authority is aware that there will be times when circumstances are out of our control. The key to a great response is to show that you are accountable when unexpected things happen.