After rescuing Dori from the clutches of the Dourhands, both Dori and Hannar agreed that the Dwarves of Othrikar shall come to the Council of Esteldín.
'Before he retired, I told Dori of your message about this Council of Esteldín. He recommended that we should go, and I agree with him!
'The dwarves shall lend their might to this Council and free all of the North Downs from the clutches of the Enemy! Go now and tell the Rangers we shall come!'
Halbarad can be found in Esteldín.
Hannar told you to bring word to Halbarad that the Dwarves of Othrikar agreed to come to the Council.