"Respondezzes sil vous plait" is a common phrase used to request a response or confirmation in French. However, there are various synonyms that can be used in place of this phrase. One option is to simply use "svp" which is an abbreviation for "s'il vous plait". Another alternative is to use "veuillez repondre" which translates to "please respond". "Merci de confirmer" is another possible synonym, which means "thank you for confirming". Additionally, "Nous attendons votre reponse avec impatience" which translates to "We are eagerly awaiting your response" can also be used to convey the same message.