Who was the 2 person who is talking on the epilouge of Metal Gear Solid (give names please)?

Answer 1

Raiden is correct... It was Revolver Ocelot, who was secretly working for then-President of the United States George Sears, who later reveals himself to be Solidus Snake in the next game.

Double and even triple-crossing seems to be Ocelot's specialty, over many decades.

Answer 2

That was Revolver Ocelot and Solidus, Solidus was the president of the United States at the time.