An Update is an Act 2 companion quest for Varric in Dragon Age II.
It is automatically unlocked after you complete one of the first main plot quests, either Blackpowder Courtesy or Prime Suspect, in Act 2.
Go to The Hanged Man and talk with Varric. Doing so will unlock his companion quest for Family Matter.
Selecting "You can tell me anything" option and agree to help find Bartrand will give you Varric: friendship (+20), not helping to find Bartrand does nothing to your status.
Selecting "Let's go get some drinks" option and then agree to help find Bartrand will give you Varric: friendship (+25), not helping to find Bartrand nets you only Varric: friendship (+5).
Selecting "Get to the point" option will give you Varric: rivalry (+10), no matter whether you agree to help find Bartrand or not.