Don't assume a woman interviewer is married; use this title that came into usage in the 1970s
I usually use Ms. if I don't know marital status, but most people you ... Miss [mis]- 
Young woman or a title of respect for an unmarried .... tell a man's marital status 
from Mr. A lot of married women still uses Ms, because they feel that Miss or Mrs 
is a little sexist since men's marital status never comes into play.