I am so sick of No Shows

Today I had a patient no show. I've had three of these already this semester. I am so sick of them. I even called her when she was 10 minutes late and she said she would be right there. NOPE. So luckily I saw a 13 year old 1b. I'm glad I got her in my chair even though I don't need that classification at all. Hopefully I get lucky in the future. I'm getting really worried though because we only have about 7 more clinic sessions and I need to find 6 more quads of a class 2 to clean. It's basically impossible to find and clean them with that much time left. I'm so discouraged. What do I do?