First I would advise you to learn the different ways to say thngs ingame: I mean(as previous said) /map is a good way to find chat as it is for the entire zone(I think) and more people….
Second: I have never tried this but when you use @ after emote it enters the selected npc’s name….not sure if that work for players with /say…. I am saying that because most of the time I, for example, dont notice people around me….and when they do /say something, I will ignore it thinking its not meant for me etc….
Another way if @ doesnt work maybe try to whisper to them?(ether /w name or select them then right click their portrait and from there whisp)
….oh and its funny bcause dungeon’s ‘difficulty’ actually makes people talk in chat so they make strategis etc:)