Focus on anything you have done in the past, paid or unpaid, that lends itself to the requirements of the position. Even if your title was not "Insurance Assistant" specifically, you can draw on your previous experience.

Don't tell the interviewer, "I don't have any." The interviewer has your resume, and if you don't have direct experience, they already know that. You're there, so the interviewer has seen something that they like about you.

"When I was with XX company, I supported several Insurance Agents by answering and transferring telephone calls, taking messages, sorting and delivering mail, scheduling appointments, and receiving customers and visitors."

"Although I do not have direct Insurance Assistant experience, I worked as a front office receptionist where I provided general information to staff, clients, or visitors, created documents in MS Office Suite, and filed paper and electronic documents."