Change the narrative style to indirect speech:
Sumon says to his friend Munir, "Playing Cross Word is my hobby." "Oh! Cross Word is a nice game", Munir replies. "Why are you saying so?" Sumon wants to know. Munir informs, "Playing Cross Word can improve cognitive skills like memory, planning and problem-solving."
Sumon tells his friend Munir that playing Crossword is his hobby. In response, Munir exclaims that Crossword is a nice game. Sumon wants to know why he is saying so. Munir then informs him that playing Crossword can improve cognitive skills like memory, planning, and problem-solving.