I have a level 5 Fallen Aasimar character. I noticed that Celestial Legacy reads:

You know the light cantrip. Once you reach 3rd level, you can cast the lesser restoration spell once with this trait, and you regain the ability to do so when you finish a long rest. Once you reach 5th level, you can cast the daylight spell once with this trait as a 3rd-level spell, and you regain the ability to do so when you finish a long rest. Charisma is your spellcasting ability for these spells.

But neither Lesser Restoration nor daylight appear on my character sheet anywhere. What do?

Celestial Legacy is a trait of the Variant Aasimar from the DMG, not of the Fallen Aasimar.