Chinese phrase
对不起，我今天没空 duì bù qǐ wǒ jīn tiān méi kòng
Meaning
Sorry I am not free today
When to use it
It apologizes for being unavailable today. It is a polite way to decline an invitation or request.
Example dialogue
放学后一起去公园玩吗？ fàng xué hòu yì qǐ qù gōng yuán wán ma
Would you like to play at the park together after school?
对不起，我今天没空。 duì bù qǐ wǒ jīn tiān méi kòng
Sorry, I don't have time today.