Officer Jessa Vai of the Flaming Fist is marooned in Beregost with her contingent. In her desperation to return to Baldur's Gate, she's offered me 50 gp for every bandit scalp I can bring her. She'll be waiting for me at the Jovial Juggler Inn.
Thank you, (Gorian's Ward). You(r) efforts have not been in vain. I just received new orders from the city: My contingent and I have been asked to return there and make our reports. You will figure prominently in them and I assure you that our accounts will be favorable. (Reputation increased by 1.)
Note: This can happen anytime after the start of chapter 4, which coincides with the destruction of the Bandit Camp. It is triggered by speaking with Officer Vai when you have no Bandit Scalps in your bag inventory. It is advisable to keep Officer Vai available as long as possible because she pays good gold for odd items (such as Tomes that increase main stats) that you may want to sell.