My Mistake

I will tell you about what i did bad on my first day in the job. I work at the restaurant like a busboy. I always have to check every single table, looking at if i have to fill up the glasses with water. Sometimes the customers order other kinds of drink, but in different kind of glass. I was looking at the glasses and I found one glass almost empty. I took the glass, so I filled the glass up with water. When I did my job, the Sr. on the table said " no, no, " it was wine. "Oh my God" I said and I apologized for what I did. But any ways it was a little bit of wine with water. I had to bring another glass of wine. That was my first mistake in my first day of my job, but I learn of my mistakes. Now I check very carefully what kind of glass is and what is in it.