Me too, even though I found the Billiards conversation mentioned before :( I've got theoretical links from the conference in the living room and two kitchen files, but the second kitchen is no good because I don't know the code for 10's bedroom and the first kitchen is no good because I don't know where 3 went. The living room I'd think would tell me who was there before john entered, but none of my thoughts on that have been right yet. Guess I'll keep trying. Please let me know if you figure it out.
Brute-forced the Living Room at time 2. Turns out
Tony wasn't there, and you can go from Billiards to Entrance without passing through. Unfortunately, after subsequently brute forcing (well, trying the like 5 rooms I have) the location of a telephone, the path dead-ends and you're just stuck :( I guess I'm supposed to know where 3 went off to or more synonyms for bedroom.