I surrendered my daughter for adoption in 1966 and found her in 1990. What I can speak on is the emotional dimension of adoption and search. I understand that reuniting people is not always a win-win situation. You may not like the result you get, but you have a right to know as much as you can find out about who you are and where you came from. To me, that's a win, regardless.
Relationships can take time to develop.
Even if the person you're finding isn't ready to talk to you today, they may be by next year. Don't give up. In addition, in our community there's the added dimension of wanting or needing to know about the family medical history. It's easy to get stopped by your considerations sometimes. One of those considerations is the law.