You would explain this is just as you told us. Discuss this as honestly as you can, factually driven not your opinion.
I was let go as the manager cited because she felt I was slow to learn the job, and that I called in late when requesting a sick day.
It was my first job, and I felt that I was training well, and I had gone to work sick a few days, and when it became aparent when the high fever hit that I should request a day off to get better it was not accepted.
I was always ontime, dressed appropriately, friendly and gave my full attention during training, and followed all the companies policies.
I regret getting sick, but I did go in sick until I was unable too, it was my mistake. Honesty can pay off big time as long as you are genuine about it. I added in............going in sick not knowing you were or not, you were coming down with it for a few days.......wink ok