The interviewer wants to hear that you are a team player and will happily help with duties outside of your job description when necessary to ensure the overall organization is successful. If you have been asked to perform duties outside of your job description, go ahead and share! Mention your positive reactions to being asked to help, and be sure to mention that you are definitely willing to help out in other areas when needed. If you have not been asked to perform duties outside of your job description, that is okay too, Simply tell the interviewer that you haven't been asked, but if you are asked, you would be happy to assist the team to ensure everything gets accomplished!