Throw in phrases sure. I wouldn't really see the point of having them outright speak in the full language considering we wouldn't know what they were saying anyway.
In addition, do we even know if dwarves by and large-especially what would likely be a low class carta member surface dwarf? I know they have their own written language, but thus far we haven't had anything in books or games saying that dwarves by and large speak that language? It may just be something for the shaperate or a ceremonial language.
Its possible the Qunari knows qunlat, it is also wholly possible that as a Qunari mercenary who is outside of the qun and is trying along with his/her merc band to be accepted in thedas, they don't speak qunlat in order to better fit in.
Dalish, yes they use phrases, and do know parts of their language, but there are also entire parts of the Elhven language that are lost.