Advice on recommendation letters:
If we did research together, then I would be happy to write you a recommendation letter.
However, if you were a student in my class, and we did not have meaningful interaction outside class, then my letter would literally say that you took my class, and what grade you got. This will not help you get into grad school, as this information is already in your transcript. If, after reading this, you still would like me to write you a recommendation letter, please email me.