Why are you pursuing a new endeavor? Perhaps you are seeking a new challenge. Maybe you need more money to make ends meet. Or, maybe you have just heard such great things about the job that you couldn't pass up the opportunity. Whatever your reason for leaving, now is the time to share it. Mention a few of the positives about your current employer, and share what you will miss about it as well. This shows the interviewer that you care about your place of employment, but you recognize that now may be a good time to make a change.