Conjure Wyrmling V.S

You call forth a draconic servant in an unoccupied space you can see within 30 feet. A dragon of challenge rating 1 or lower appears and makes a contested Charisma check against your control. The dragons disappears when it drops to 0 hit points or when the spell ends.

The dragon is friendly to you and your companions for the duration. Roll initiative for the dragon, which has its own turns. It obeys any verbal commands that you issue to it (no action required by you). If you don't issue any commands to the dragon, it defends itself from hostile creatures but otherwise takes no actions.

If your concentration is broken, the dragon doesn't disappear. Instead, you must win a contested Charisma check with disadvantage against it or you lose control of the dragon, it becomes hostile toward you and your companions, and it might attack. An uncontrolled dragon can't be dismissed by you, and it disappears after 1 hour when the spell would end.

The GM has the Dragon's statistics. Sample dragons can be found below.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the challenge rating increases by 1 for each slot level above 3rd.

Sample dragons