The language wasn't completely new to Tom Riddle. In his own time there were still wizards who used such wording to communicate to him in his very own school. While Tom was very busy scribbling down a bit of information, he could spare a seat beside him and perhaps a chat. After all, there was a good chance this woman could be good for his cause.
"By all means." Tom moved over for her and closed his book, grinning at her. "I could always use some company. My name is Tom."