If they say no, you've either done a bad job or they don't really want a financial advisor. If it's the former, this is not the time to try to correct what you did poorly earlier in the interview. Gracefully abandon ship. If it's the latter, and you can tell that what they really want is just to buy a specific product, refer them to a reputable financial products salesperson. Trusted advisors plan first then implement.
Salespeople match products to needs.
Of course, if they say yes, then there's your proof of a good fit with the client and that you've conducted a perfect first interview up to this point. Another possible response is the question of cost, and it puts you in a perfect position to get a commitment to implement, regardless of whether you work on commission only or write strategies for a fee. In discussing cost, you can segue seamlessly to the next question, as shown below. The answer is pretty important to both of us. I get paid when you implement your financial strategy.