Tony watched as she compared schedules, a bit curious at first as he wasn't quite sure what she was doing. When she explained, however, he nodded. It was good that she had not just rushed into agreeing without being sure that she would be able to do what she said. It was much more respectful to be sure before committing to things, after all.
"I think too this will show that one does not have to have dislike for the other houses. There is a lot of animosity between Slytherin and Gryffindor, and so seeing respectful exchanges between duels should give a good example." Not that he expected it to be entirely respectful between the two houses, there was too much ingrained dislike for that, but a start could hopefully be made to reach out to the more amiable of each house to build bridges.