<human>: Could you distill the essence of the text into 1-3 sentences?

After my sister finished getting her hair done at a local beauty salon and trade school, she received a coupon for a free haircut.  She offered me the coupon to which I accepted. Later that day, I went to the same place my sister had gone and presented them with the coupon so I could get a free haircut.  

A nice young lady got me settled in my seat and asked me what kind of haircut I wanted.  I had pretty short hair to begin with (borderline shaggy), so I told her I didn't really care.

She was really careful when cutting my hair and she constantly kept asking other hairstylists for assistance.

about an hour into my haircut, I had realized that I was a practice dummy for a student at the trade school.  

The haircut ended up taking about 4 hours.
<bot>: Went to a beauty school for a free haircut; realized I was a practice dummy for one of the students and ended up staying there for 4 hours.