The Arabic expression "يرجى التكرم بتلبية الدعوة" is a lame translation of the French expression "Repondez, s'il vous plaît," which means, "Please respond," which is commonly used in its abbreviated form, "RSVP" (also "R.S.V.P."), in English. The Arabic word تلبية is an incorrect translation of "respond," but why argue with the source text when you can translate it back to the real idiomatic expression.