Mina planned to take the early bus to a museum. On Saturday evening, she checked the museum website and learned that it opened an hour later on Sundays. She sent Joon a voice message: “I was going to take the nine o'clock bus, but the museum opens later tomorrow. Let's meet at the station at ten instead.” Joon first heard only “nine o'clock” and wrote down the wrong time. After reading the transcript, he marked the phrase “was going to” as an earlier plan and the word “but” as the point where the plan changed. He then replayed only the short segment around the contrast and repeated it in meaning groups. The next day, he listened to a different message with the same pattern and identified the revised time without seeing the text.