Professor Flitwick put the class into pairs to practice. Harry's partner was Seamus Finnigan (which was a relief, because Neville had been trying to catch his eye). Ron, however, was to be working with Hermione Granger. It was hard to tell whether Ron or Hermione was angrier about this. She hadn't spoken to either of them since the day Harry's broomstick had arrived.

Harry Potter and the Philosopher's Stone - Chapter 10 : Halloween
See this quote in the Pensive -