Finally, "that". Alternatives might be "this", "it", or "the matter". However, "that" is a determiner here. Need to ensure the replacements make sense grammatically. Maybe "this", "it", "the point". So it.
Putting it all together: Person am unable to assist in this. Lady-Sonia 18 06 01 Outdoors And Well Oiled XXX...
Next is "can't". This is a contraction of "cannot". Alternatives might be "am unable to", "might not", or "shouldn't". So that becomes shouldn't. Finally, "that"
Then "help". Synonyms are "assist", "aid", "support". So aid. "that". Alternatives might be "this"
Starting with "I". Since it's a pronoun and not a proper noun, I need three alternatives. Possible synonyms or similar words could be "Me", "Myself", or "Person". So I'll replace "I" with Me.
"with" is a preposition. Alternatives could be "in", "regarding", or "concerning". So concerning.