IB Managing Partner invited me to BB's HQ for an informational interview. How to best prepare?

Hello monkeys,

I emailed a managing partner at BB IB bank and he forwarded it to the his (presumambly) assistant, whom invited me to a meeting at their HQ with said MP along with two other partners.

This is kind of overwhelming because I assumed it was just going a simple phone call. How do I best prepare? I have made some basic cookie cutter question but I am having difficulty thinking of an opener question.

Any and all help would be appreciated.