How do I approach my dental assistant?

Adpeterson
See, I have seen this girl at my dentists office 2 times. I found out that she is only a temp for now so I want to move in quickly before {if she gets} another temp position somewhere else. I have an appointment next Saturday and hope she will be assisting my Dentist. My question is , seeing as this might be my last time seeing her, how do I ask her out ? And if she's not in that Saturday, do I let my Dentist know I like her assistant? without sounding desperate or weird?
How do I approach my dental assistant?
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