Ramadhan holds the promise of the acceptance of duas to a much greater degree than at any other time of the year. Abu Hurairah (RA) reported that the Prophet Muhammad (pbuh) said: "There are three people whose supplications are not rejected: the fasting person when he breaks his fast, the just ruler and the supplication of the oppressed" (Tirmidhi, Ibn Majah and Ibn Hibban).
A Recommended Dua for Ramadhan
Allahumma innaka 'afuwwun kareemun tuhibbul 'afwa fa'fu annee
"O Allah, You are the Best Forgiver, Beneficent and Merciful. You Love forgiveness so forgive me." (Al-Tirmidhi).