how to tell my fiancé to talk about dowry with my parents?

Dowry is my country tradition and culture for marriage. I am an only child that means alot in my country. My fiancé is an American. So it's known that our culture are different. My fiancé paid for the immigration to get me a visa to marry him and will pay for the wedding in the US. I talked to my parents how much money do they want from my fiance and they said they were not gonna ask for it but he should asked them to show that he concerns about our culture and they will not get money from him. I never told that to my fiancé because I think he might work on culture and realize what he should do. But now I got my visa and ready to travel. He still never mentioned it to my parents. My parents never talked about it to me agian but I know they will be disappointed. I would like to tell my man to ask them that how much money they would like for dowry. But I don't know how should I tell him because I don't want him to misunderstand that my parents want his money. Because all of my generation, after parents got dowry then they will return 80-100% to the couple. My English is not very well. Sometime I say thing but he misunderstands so could you guy tell me what should I tell him?
Thank you so much