HAVANA — A jubilant flag-raising at the reopened U.S. Embassy in Havana is giving way to serious talk about the road ahead in improving relations between the United States and Cuba.

Capping off a Friday in Havana that began with the Stars and Stripes being hoisted outside the embassy, Secretary of State John Kerry met with Cuban dissidents in the evening and said the island will not see an end to the despised U.S. trade embargo if Cuba’s single-party government does not make progress on human rights.

Cuban and U.S. negotiators are to meet in Havana in early September to begin talks on normalization of the relationship between the two countries, which includes topics ranging from maritime security to the embargo to human rights.

He said negotiations will follow three tracks. The first will encompass areas in which rapid progress is expected, such as cooperation on naval matters, climate change and the environment. The second will tackle more complex topics like the establishment of direct airline flights and U.S. telecommunications deals with Cuba. The last will take on the toughest problems, including the embargo and human rights.

While the three tracks will proceed simultaneously, Kerry said, Cuban leaders should not expect to see progress on the embargo without improvements in civil liberties in Cuba, which does not allow independent media, political parties other than the ruling communist party or direct election of anything but low-level municipal posts.

“There is no way Congress will lift the embargo if we are not making progress on issues of conscience,” he said.

Kerry began the day with a nationally broadcast call for democratic change, saying “we remain convinced the people of Cuba would be best served by a genuine democracy, where people are free to choose their leaders, express their ideas, practice their faith.”