Some omni buff clans and there are clans that buff omni. Ill buff anyone if i see it. There has been times when ive changed chat tab from the one i was speaking to to find tells asking for buffs,help,advice that i missed. Often ill send a tell back and sometimes they have logged off but just because some one doesn't buff you or respond doesn't mean they arnt willling. Alot can happen to help you miss comments or questions from other chat windows to rl phone calls , knock on door etc could mean they haven't seen. Asking in otooc is probably the best way first in my opinion falling back to tells towards people you see if you get no response.