This event in RPG Maker Fes will cause your game to freeze and allow the player to choose YES or NO from a window in game. You can decide what other event will happen based on the player's answer. You can also change the text from YES/NO to whatever you want.

Once you choose this event, it adds a branching path to the event contents list. You can add what happens next.

You can also add another YES and NO question after a YES and NO question. You can do this for each branch up to six times.