I'm not good in writing dialogues, but I definitely know that before the interview you should get all the important information about the company and while speaking with interviewer it's better to demonstrate your interest and motivation to work in the company. As a rule interviewees use a tone of voice that transmits security. Also they maintain the degree of closeness ans formality that the interviewer sets. In general there are too much rules. I prefer just be myself when I'm going to the job interview, because now people rescpect some human characters more that tone of voice and formalities.