How to get a decent recommendation letter? I am trying to ask one of my professors to write a recommendation letter for me, but he did not say yes directly, instead, he said he would be willing to talk with me to hear more about my plans.

I did not interact with him too often when I took his course(a PhD-level pure math course). But I did get an A in that course(I did bad in the midterm, but pretty well in the final). I think he is still hesitant as to whether to write me a letter or not. When I go talk to him, how can I persuade him?

I am certainly not expecting a strong letter from him. I think my background is okay(8+Phd-level courses all A or A+, 1 REU), but the problem is that he probably did not know much about me. So my plan is to take my list of schools and abstracts of advanced courses with me when I go meet him. Is there anything else that I can do?
I do not interpret what he wrote as necessarily discouraging.  He may just want to get to know you better so he can write a better letter.

Just talk about yourself and your academic interests.  What has been your favorite course so far?  What did you like about it?  What would you like to do in the future?  Etc.