Walaikum Assalaam Warahmtullahi Wabarabarakatuhu,
One of the best supplications one can and should make on this most blessed of nights is the one the Prophet (peace be upon him) taught Hadrat Aisha (Radi Allahu Ta’ala Anhu):
Aishah said: “I asked the Prophet (peace be upon him): ‘O Messenger of Allah (peace be upon him), if I know what night is the Night of Qadr, what should I say during it?’ He (peace be upon him) said: ‘Say: O Allah, You are The Pardoner and You love to pardon, so pardon me.’ “
(Related by Ahmad, Ibn Majah, and by at-Tirmidhi)
May Allah Subhanahu wa Ta’ala forgive us and guide us to the straight path.