Put the applicant at ease. Extend professional courtesy
Greet the applicant as they enter your facility, have them guided to the room where the interview will take place, offer a refreshment (water is perfectly acceptable and suggested). Smile and be warm but keep small talk general so that you do not inadvertently venture into any protected areas. Remember you are trying to get to know the applicant and how they will fit into the organization not to trip them up. Interviews are already stressful events, do your best to put the candidate at ease to gain the best understanding of them.