This is an example sample of a sinner's prayer from jesusofthebible.net.
"Dear Jesus, You know everything about my past and You know my heart today. I admit I am a sinner (Romans 3:23) and I deserve hell (Romans 6:23). Today, I fully and forever surrender and submit to You God and to the truth of Your Word, the Bible (John 1:1). I believe that You, Jesus are the only Son of God (John 3:16) and You love me (Romans 8:39). Thank You, Jesus for dying on the cross for me, paying the price for my sins, my eternal death and suffering (Revelation 21:8). I won’t go to hell because of what only You have done. I owe my life to You, Jesus. Today, I give it. I confess You to be my LORD (Romans 10:9). I reject my selfish will. I repent and turn from my sinful ways (Matthew 4:17). I renounce false religion and all other lies from Satan (2 Cor. 10:5). Thank you that I only need You, Jesus (John 14:6). You alone are holy (Revelation 15:4). You alone were sinless (Luke 1:46). Thank You that I am fully forgiven of all my sins, all past and all future, forever. Thank You that I don’t have to work for my salvation (Romans 3:28). It’s Your gift to me, only offered by Your grace and only received by my faith (Ephesians 2:8-9). There is nothing I can or must do to earn it. Thank You that I don’t need to follow a religion, only You. Thank You that Your Word promises me my eternal life in heaven (John 10:28), not religious rituals, church traditions or man’s wisdom (Matthew 15:3). Now, I can live every day finally free from all doubt (1 John 5:13). Thank You Jesus, for rising from the dead to give me life (John 14:6). Come into my heart by Your Holy Spirit to lead and live in me. Thank You Father that right now, I am born again (John 3:3), as a fresh, new child of God (2 Corinthians 5:17), forever set free by Your truth (John 8:32). Thank You for my freedom (2 Corinthians 3:17) from bondages to guilt, fear, worry, anger, shame, religion, opinions (1 Corinthians 2:15) and more. Thank You for Your priceless gifts (Galatians 5:22-23), especially peace. Thank You, Jesus for being my Savior and my living, loving LORD."
Source - http://jesusofthebible.net/home/how-to-be-saved/sample-prayer-for-you-to-be-born-again/
