"If you don't find me in Jannah then ask about me..."
Surely the people of Jannah when they enter and they don't find those companions of theirs who were with them upon good in this world, they will intercede for them in front of Allah (swt) and they will say:
"Oh Rabb we have brothers and sisters who used to offer salah and fast with us, we do not see them?
Allah (swt) will say, "Go to the fire and take out any person who had even an atoms amount of emaan (faith) in his heart."
Hasan Basri said, "Have lots of believing friends because they will be able to intercede for you on the day of Qiyamah.' If you don't find me in Jannah then please ask about me..."
Sahih Bukhari 7704