I advise anyone preparing for an HR interview to not follow the advice given by those saying you should not prepare for hypothetical questions. In fact, you have to prepare for every possible questions because the goal is to score points with the interviewer. You have to come up with great answers, not good answers, and score more points than other applicants.
If you don't prepare, you might come up with 2 or 3 good points in your answer; on the other hand, if you prepare well you will come up with 5 or 6 good points, and the interviewer(s) will be more impressed by you than by others who just gave "good" answers.
It takes time to prepare for an HR interview, and I strongly advise you pick up a book about pilot interviews for that matter. When reading interview gouges, take not of the questions and discard the answers given by other applicants. They might not apply to you: someone with a lot of experience is expected to come up with a better, more thorough answer than someone with little experience, etc. Prepare your answers well in advance, practice a few mock interviews with someone, go back over your answers and improve them.
There's a lot more to say but all can be found in pilot interview prep books.