Syrian Foreign Minister Walid al-Moallem told reporters that the government team will head to Geneva tomorrow but will not stay more than 24 hours if the opposition does not show up.
The talks are scheduled to begin Monday.
The last round of indirect talks collapsed on February 3 over a Russian-backed government offensive in Aleppo.
The new round of negotiations comes amid a two-week partial cease-fire that has mostly held.
It also wants the restructuring of Syrian security forces.
The dispute over the fate of Assad has been the main obstacle in previous rounds of talks.
UN envoy Staffan de Mistura has called for presidential elections in the next 18 months, but al-Moallem dismissed the idea.
"Neither he nor anyone else has the right to talk about presidential elections. This is an exclusive right of the Syrian people," the foreign minister said.
Al-Moallem then turned to the head of the delegation, Syria's UN Ambassador Bashar Ja'afari, and said: "Bashar. This is a red line."
Assad, whose family has ruled Syria for more than four decades, was elected to a new seven-year term in 2014 in an election boycotted by the armed opposition, which controls large parts of the country.
Syria's conflict began five years ago with mostly peaceful protests calling for political reform.
A brutal government crackdown led to the rise of an insurgency and a full-blown civil war that has killed more than 250,000 people and displaced half the country's population.
"We are optimistic that we have begun to come out of the crisis," al-Moallem said, referring to recent battlefield advances by government forces with the support of Russia, Iran and Lebanon's Hezbollah militant group.
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