Good secretaries do not dream big, at least not in terms of promotion. They know that the possibilities for career growth are limited, if any.
People want to hire secretaries who would stay for a long time, and who would be happy about their daily job. They do not seek someone who dreams of promotion.
Therefore you should do your best to convince the interviewers that you would be happy to have the same job in five years time. Of course, you can leave the company in one year time or even in one month, if you get a better offer, or if you feel like leaving. You do not need to stick to the promises once made in an interview.
I would love to work as a secretary in five years time, doing a good job. I enjoy this profession, and I am not looking for something else.
I do not have any career plans. However, I am thinking about starting a family in four or in five years time. I would be glad to work as a secretary until then and be able to come back once my maternity leave finishes. However, we never know what tomorrow will bring, so maybe my plans will change. We will see.
Do not be afraid to talk about personal goals
Each responsible person has some goals. Interviewers do not like applicants who say that they simply do not have any plans for the future. Be humble, honest and enthusiastic about the future. Tell them about your personal goals, ideally those that do not interfere with your ability to work for them. That would be a great interview answer for a secretary.