Bósi thanked you for your part in gathering materials for the crafting of new pick-axes, and sent you to Brogur so you may lend your aid to his cousin.
'Bori is a good lad, and will grow into a fine dwarf. I reckon his preference for tale-spinning over hard work will pass in time. My cousin Brogur and I were no different when we were his age.
'It will take some time to fashion pick-axes from the materials you have delivered. While my dwarves are working on that, I ask you to lend your aid to Brogur. If you truly wish to assist the dwarves, not a moment shall be idly spent!
'You will find my cousin north of here, somewhere along the road that winds up to the Hollin Gate. He is gruff, even for his line, but will welcome your help.'
Bósi's cousin Brogur is somewhere along the road that winds up to the Hollin Gate, north of Bósi's position.
Bósi has asked you to lend your aid to his cousin Brogur while the pick-axes are being crafted.