Thai สบายๆ, สบายสบาย phrase that essentially translates to "Take it easy...", "Carefree", "No worries", "That's easy."
THIS IS NOT THE SAME AS SAYING "No worries" if someone says sorry. This saying is more of a mindset than a response.
Don't worry about that spilled milk, we clean it up and pour you a new cup...sabai sabai.