A Settler Needs Your Help (quest)

Walkthrough
Go to Kendall Hospital and fight through the ghouls, mole rats, deathclaws and a glowing one located on the first room of the 2nd floor. Eventually the dwellers will meet Preston Garvey on the 2nd last room of the 3rd floor. Speaking to him will complete the quest. You may then go to the last room of the 4th and final floor to loot the managers office or return your dweller to your vault.