"Ah, Priest Tunfer! I'm glad you heard of us coming. Perhaps you know that Randal Morn has called on us to stop the drow raids on these lands, for the good of us all."
Rashak lets that sink in for a moment.
"Randal Morn told us that you would aid us with healing magic, as our quest is for the good of Daggerdale, and also because his sizable donations in the past to your church. However, if you're doing nothing more than selling goods here, then I will let Randal Morn know he was mistaken, and I will purchase my goods at the temple of my own diety."
Rashak pauses for a moment, to see if Tunfer is going to give them anything for free, or at least give them a discount. If not, he will go to a temple of Tymora and purchase items there, making friends with the local priest (Rashak is a priest of Tymora, and will give them his business before giving it to another deity.).
OOC: Diplomacy +12 on Tunfer
Edit: Edited text in bold