Find Cappi McTarnigal upstairs in the bank at 198.19, 170.87, 29.75
You say, 'hail Cappi McTarnigal'
Cappi McTarnigal says 'Hail there Runengetum ! If you are not a [member of the White Rose], then it be best that you stay on the lower level. This here floor is for honest ...ermm respectable rogues only.
You say, 'I am a member of the white rose'
Cappi McTarnigal says 'I hope that you are indeed respectable, and loyal to Halas and the Rogues of the White Rose. To do otherwise would bring the wrath of the Six Hammers down on you. But enough with talk! Our caravan to the frigid north leaves in less than two days, and we are short on mammoth calf hides. Return four of them and you will be given items that show your loyalty to our Clan.
Ysanna MacGibbon says 'The mammoth calf hides are used to shield our beasts of burden from the icy wind. You are probably now asking what shields us Northmen from that same icy wind eh? Well, along with many other furs and leathers, we have come to find that [gnoll fur] of all things is a good insulator against the cold. Look at their tiny bodies and it's obvious their fur does something good.
Note that Ysanna MacGibbon spoke even though I was not speaking to her. These comments start the Ysanna MacGibbon Gnoll Fur Quest. I then went out and killed Mammoth Calves to obtain 4 Mammoth Calf Hides which I gave Cappi McTarnigal for the following response:
Cappi McTarnigal says 'I will do nothing to aid beings like you.'
The reason for this response was undoubtedly because I canned Dubious to him. Indeed, I had to be cunning and use my sneak skill to get the dialogue as far as I did to get the quest in the first place. It may be possible to do this quest before the Langseux quest.