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Make eye contact with the interviewer and listen attentively so you can give thoughtful answers to their questions. Don't interrupt the interviewer while they're talking, but write down any questions that come up so you can ask them later. When they ask you a question, answer it to the best of your ability, but don't make up answers since you won't seem genuine. If you need clarification on a question, ask the interviewer to show that you've been listening and you want to answer as best as you can. It's okay to say “I'm not sure” if you don't know how to respond to a question in its entirety since the interviewer will respect your honesty. When you learn the interviewer's name, incorporate it into your conversation a few times so they feel more open around you. Only use their name when it sounds natural since overusing it could make your interviewer feel uncomfortable.  For example, you may add their name to a question like, “What are some of the duties you expect from me, Deb?” If you're able to, ask the interviewer for their name before you come in so you can address them by it right away when you arrive. Maintain good posture, but lean slightly forward so you seem interested in the interviewer. If you notice the interviewer doing an action, such as rubbing their nose or lacing their fingers, wait a minute or two before subtly doing the same action. The interviewer will subconsciously think that you're similar to them and you'll make a better connection. Don't get too distracted by the interviewer's mannerisms that you aren't listening to their questions. Don't try to tell jokes to get a laugh out of the interviewer, but be genuine and insert humor if it's appropriate instead. Smile and don't be afraid to laugh a little during the interview if the employer is receptive to it. Having a good sense of humor can help the interviewer see who you really are and will help them connect with you more on a personal level.  For example, if you're walking down a long hallway to an interview room, you may say something like, “Well, I won't have to do cardio for the rest of the day after all.”  If the interview has a more serious tone, then stay more formal throughout.
Be polite and honest throughout the interview. Address the interviewer by name so you can feel a connection to one another. Mirror the interviewer's body language subtly. Show your fun personality while you're interviewing.