Sure, no problem!
Your sentence: "I can not understand you well" is mostly correct, but it's better to say: "I can't understand you well." We usually use the contraction "can't" instead of "can not."
Also, if you want more details, you could ask: "... more Sure, no problem!

Your sentence: "I can not understand you well" is mostly correct, but it's better to say: "I can't understand you well." We usually use the contraction "can't" instead of "can not."

Also, if you want more details, you could ask: "Could you explain that a bit more, please?"

Let’s try again: How was your day today?