Hannah asks the first question of Chris.
She says “I was wondering whether you could expand on the section regarding product design.”The phrase “I was wondering…” means I would like to know, or I'm curious about something.
You might be wondering, or wanting to know, whether this is the way people really speak at business meetings, and I can tell you that yes, it is.Hannah is wondering, or wants to know, whether Chris can expand on the section regarding product design.
“To expand (expand) on something” means to provide more detail about something, to describe something in more detail, or to provide more information.Hannah wants more information about product design.
We could expand, for example, on this definition more - give you more information, more details, but I think you probably understand it already.Hannah asks, “Am I correct in assuming that you want to offer the product in more colors?” The phrase, “Am I correct in assuming…” means “Is what I am saying right? Is what I am saying the truth, is it correct?” It could also mean “Do I understand what you are saying correctly?”
She's repeating what she understood from what Chris had said earlier, and she's asking Chris to say whether or not she understood him correctly; did she get the right idea from Chris's explanation.