Responding to this question will likely vary based on where you are in your career. If you are fresh on the scene, think about what steps you're taking now to get to where you want to be, then identify what that ultimate goal is. If you are seasoned in translation, then think of the trajectory you've had thus far, how close you are to that goal, and what might've changed for you along the way. Taking your interviewers on the journey with you, whether at the start facing ahead or looking back on all you've accomplished, will draw them in and better contextualize why your dream is your dream. Consider asking yourself what texts you hope to be translating, what clients you want to work with, what languages you'll be translating, and even where you will physically station yourself (i.e. working from home versus an office).