They already can, look in the journal. I cannot understand why people continue to pretend this doesn't exist.
The conversation shows in the journal, updating in real time, including the player responses.
If someone talks to some NPC after the other player starts a conversation then it messes up. Every time a new line is said it resets the window. This happens with my friend a lot as I run around with Pet Pal or want to talk to the minor NPC for a moment since I can read faster than him and
would be able to catch up.
