1. They go to school together
Evidence: Message one says, "I'm sad you didn't sit with us today." Message two says, "How would you have felt if it was your first day at a new school?"
2. It was the first day of school
Evidence: Message two says, "How would you have felt if it was your first day at a new school?"
3. I can conclude the speaker is friends with a group of people and eat lunch together. The speaker was helping out a new student and sat with them.