What does 'Pardonnez-moi je ne sais pas' mean in English?

The phrase 'Pardonnez-moi, je ne sais pas' means Excuse me, I don't know... . In the Word-by-Word translation, the verb 'pardonnez' means '[you] excuse, pardon'. The personal pronoun 'moi' means 'me'. The personal pronoun 'je' means 'I'. The adverb 'ne...pas' means 'not'. The verb 'sais' means '[I] know'.