There's a saying, you can't reason someone out of something they didn't reason themselves into; Charisma is what you use instead. Of course, on the flip side, a charisma-based social attack doesn't typically include reasoning*.
*: If you have solid reasoning, then you don't generally need a social attack. Assuming the target is capable of listening to evidence. Rolling wits or perception / investigation may be an option, when you aren't sure what the reality is but think Amu should be able to figure it out.