I am not sure what you mean by "talking to them" - there is no one to talk to. One person keeps coming into the room after each battle (they seem to be infinite)
There are not here everytime. You have to fight a few combat and try each time to check the room
If nothing change, it's a bug, and you'll have to reload an older save
Beware: you must truly enter that room each time. The wall prevents you to see truly what's in as long you just get in font of the door
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On the north of your cell is a door, open it and speak to the Githyanki named Simyaz
If nothing change, it's a bug, and you'll have to reload an older save
Beware: you must truly enter that room each time. The wall prevents you to see truly what's in as long you just get in font of the door