you can find them when you're walking around after the fight with aeran, they're one of the people you can choose to talk to and they're on the eastern gallery if i'm not mistaken
After the fight with Aeran, you can choose to talk to Veyer, Mel or Phaedra. But i believe you can only do that if you are not drunk and you can only meet Veyer specifically if you have impressed them during the meeting with Lethalis. Hope this helps!
It's during the meeting with Lethalis but i don't know what are the exact choices. The discord server can probably help you tho if you are interested. There is a whole channel there for gameplay help.
