The movie "Chalte Chalte" revolves around the lives of Rahul (Shah Rukh Khan), a tour guide, and Natasha (Preity Zinta), a beautiful and free-spirited woman. The two meet on a bus journey from Agra to Delhi, and their lives take a dramatic turn. As they travel together, they share their stories, laughter, and tears, eventually falling in love. However, their relationship is put to the test when they reach Delhi and are confronted with the harsh realities of life.