From Longman Dictionary of Contemporary EnglishI’m afraidI’m afraidspokenFRIGHTENED used to politely tell someone something that may annoy, upset, or disappoint them That’s the most we can offer you, I’m afraid.I’m afraid (that) I’m afraid you’ve come to the wrong address. ‘Is she very ill?’ ‘I’m afraid so (=yes).’ ‘Did you see him?’ ‘I’m afraid not (=no).’ → afraid
Examples from the Corpus
I’m afraid not• "Have you got change for £20?" "No, I'm afraid not."• "Are you coming to the barbecue tomorrow?'' "No, I'm afraid not. I've promised to go and see my Mum.'' 