This question isn't a guarantee they'll ask you back for the next round, but how you answer the question could inch you closer to that opportunity. Try to be as flexible as possible with your availability, while exhibiting a thoughtful approach. When asked this question, take a moment to look at your calendar to showcase your project management and time management skills in real time. This will give them greater confidence in your abilities and effectiveness as a professional. It might also hint that there is competition out there to hire you, and that you are a desirable asset with greater professional worth. Whereas, being too flexible may indicate you don't have much else going on, or that you put little thought into it before answering. Worse yet is reaching out later to reschedule. This will serve as a red flag, and that you pay attention to the details of your own schedule.