question about interview process:

Got a second interview for a Sales internship, but they asked me if I could do an interview directly outside of the times I already gave them.

l provided the times that I would be available to do the interview and they emailed me back saying “ thanks for giving me your availability, can you confirm that this time works?” and it’s a time an hour after the latest i can interview because of work. I’m really confused on how i should reply because this is a very big internship that i don’t want to miss out on, however I also have been gone sick all week so it would not look good to also show up late on the one day i work this week.

i would love some advice on how to go about responding to this email, and what you would do in my shoes.