Bait and Switch is received in Act 1 if Hawke completed the quest A Business Discussion. The version solely depends on who helped Hawke during the quest the Destruction of Lothering.
Letter[]
Hawke,
You might be interested in something that's come up. A contact of mine, a fellow by the name of Anso, is asking around for someone competent regarding a job, and I suggested you. He's always paid well, so if I were you, I'd check into it before someone else snaps it up. He said he'll be in the Lowtown Bazaar at night.
Athenril
If Hawke sided with Meeran...Hawke,
A dwarf named Anso contacted the Red Iron looking for contract work. Wish I could take him up on it, but we've pressing business, so I recommended you. The dwarf pays well, so don't be a fool and miss out. Look for Anso in the Lowtown Bazaar at night if you're interested.
Meeran