This is a bit off topic, but I’ll address it.
I noticed that VO issue the other day in the Black Citadel and sent word over to the Audio team. If you find this happening again, can you create a new thread in the appropriate forum and attach a screenshot? We need to see the chat log output (or the text bubble for the missing VO) to get a repro. Thanks!
I also played Dragon’s Reach Pt.1 today. It seems that the missing VO sentences are the one directed to your character, not between NPCs. I found them missing on Kasmeer, Taimi and Rytlock iirc. The text does show up in the chat log, can’t remember about the bubbles.