While he continues searching his pockets (remember he has MANY), the bus driver gets annoyed and asks them to take their seats. Patrick doesn’t have change and Spongebob cannot find his wallet. Because he is having difficulty finding his wallet while holding the balloon, he asks Patrick if he has any change. When Spongebob is asked to pay the 50¢ bus fare, he looks for his wallet and not specifically for change. Minor correction that might help with your question OP.