You may say 'nihongo ga hanasemasu ka.' （日本語が話せますか）Or, alternatively, 'nihongo ga dekimasu ka,' （日本語ができますか）among other ways.
Ogenki desu ka?
Translated literally, "how are you?" would become "kibun wa?", or "o-genki desu ka" which means "are you well". If you just want to greet someone, you can say "ohayo/konnichiwa/konbanwa" meaning...
US General Norman Schwartzkopf.
no