Gaunter O'Dim is an NPC in The Witcher 3: Wild Hunt.
He is a merchant by profession.
Gaunter gets them both a drink. He does have information.
Geralt is happy to finally get some useful information in this tavern.
Geralt: Looking for a woman
Gaunter: Ahh, like everyone
Geralt: Not like everyone, and not just any woman. Mine smells of lilac and gooseberries, dresses in black and white.
Gaunter: Two schnappses! Hah. It'll life your spirits.
Geralt: Fine, I'll have a drink. Can we cut to the chase? You seen her or not?
Gaunter: Yennefer of Vengerberg?
Geralt:' Never mentioned her name.
Gaunter: Yet you described her perfectly. And once I hear something, I never forget. Can't help it.
Geralt: How do you know Yen?
Gaunter: What a question. Master Dandelion's ballads, of course. The only way a humble merchant might hope to rub up against greatness. Unless, that is, he's as lucky as I am.
Geralt: And runs into a very patient witcher?
Gaunter: Into Geralt of Rivia himself. The Butcher of Blaviken.
Geralt: You seen Yennefer?
Gaunter: Deepest apologies, but I must ask: is this about love?
Geralt: Guessed it. It's love.
Gaunter: I knew it at once.
Geralt: What do you know? Tell me.
Gaunter: Before you appeared, it never occurred to me that might've been Yennefer. Who would've thought...
Geralt: Get to the point.
Gaunter: At their camp. She rode in there - dark of night, black and white, gooseberries and... yes, I know. Had a terse exchange with the garrison commander and raced off.
Geralt: Where to?
Gaunter: I'm not omniscient. Ask at the garrison
Gaunter: We man of the road stick together. Perhaps one day I'll be in trouble and you'll be nearby to help.