I’ve playtested this game multiple times. You can interact with the NPCs in the two office buildings. Although, the second NPC in the second building can end up saying or doing nothing when triggering enough dialogue moments in the game. Although, if you meant that you wished you could have had further or branching dialogue with them, then that makes sense. Again, instead of the player actively changing the flow of the conversation in real time, it’s changed through where the player decides to walk or who they choose to talk to and when. Thus, it’s a roundabout and annoying way to see different endings for the completionist. Although, if you can’t interact with the second NPC at all, then that’s a problem. Let me know if that’s the case if I’m not mistaken.