Yo we're paired for Classic Warmup r2, I'm gmt+1 and would preferably play at the end of the week. Something like Friday night or kinda anytime on the week-end would be the best for me, let me know what works for you
Since you tried to schedule then thats all you can do. If he doesn't attempt to get back to you then you get an activity win at the end of the round and advance to round 2. There won't be any more substitutes so other than reminding your current opponent you can only be patient.