Champions and Captains
Head to the Viscount’s Keep and talk with Aveline. What you talk about is reactive of what you did in the previous Acts.

A Talking To
Head over to Merrill’s Home and speak with her to complete this quest.

Isabela’s Regret
Find Isabela in her usual spot at The Hanged Man. Talking with her will let her back into the party.

The Storm and What Came Before It
Find Varric in his room in The Hanged Man. Speak with him to finish this quest.