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As per the ticket issued for Mr. Perez, the allowed checked baggage is 2 pieces up to 30 Kg, therefore, he requested us to add additional 23kg baggage as he will be carrying 23 kg baggage over the allowed weight.

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"Therefore" doesn't make sense in the sentence.

With regard to the ticket issued to Mr. Perez, the allowed checked baggage is 2 pieces up to 30 Kg. Mr. Perez requested to check an additional bag weighing 23 Kg., which exceeds the allowed weight. Consequently, he will carry his additional bag onto the plane.