Cassard must stay in Mord Souq, and Alisaie's friend Tesleen offers to guide you the rest of the way.
This quest is available if you have completed the quest Working off the Meal.
Starting the Quest
Talk to Tesleen in Amh Araeng to begin the quest.
Talk with Tesleen
Be sure to attune to the Mord Souq Aetheryte if you have not yet done so, then go to the quest icon on the map and talk to Tesleen.
Defeat any Coyotes that Threaten Tesleen
Go southeast to the orange circle on the map. Dismount and enter the purple circle, then defeat the Wandering Coyote that attacks.
Speak with Tesleen
Talk to Tesleen to proceed.
Scout the Area Ahead
Go southeast to the orange circle on the map. Check on the Destination, then defeat the two Wandering Coyotes that attack.
Talk with Tesleen Again
Go north to the quest icon on the map and talk to Tesleen.
Talk with Tesleen Once More
Go southeast until you can go southwest to where the orange arrow is pointing in the minimap. Talk to Tesleen to complete the quest. There will be a cutscene.
Next Main Scenario Quest
After you complete the quest, talk to Tesleen to accept the next quest: Following in Her Footprints.