简单的嵌套for循环错误输出1004错误

I am currently writing a simple macro to determine who is scheduled during what time slot and record that time slot on another sheet. Everything works just fine until until the name of the person who is on the last time slot is compared to the last time slot. At this point the for loop "j" goes to -1 and causes the macro to error out. I am currently writing a simple macro to determ