The interviewer wants to know that you are a reliable person. Tell the interviewer that you are reliable and do not call off from work unless you would have an emergency or are very ill. Next, share with the interviewer how few times you have called off from work in the past year. If you were sick with the flu and had to call off work 2 days in a row, that's to be expected! Simply tell the interviewer that you had the flu and had to call off 2 days in the past year. We are all human and get sick from time-to-time. Missing work for those 2 days will not be a deal breaker.