Canon Background
https://awoiaf.westeros.org/index.php/Davos_Seaworth

In-Campaign
Davos was hired by Godric Borrell to transport Ned Stark, Jardon, Carsen, and Darron from Sisterton to White Harbor. Lord Stark then secured passage for his companions to Gulltown.

In 283 AC Davos encounters his former passengers at the cramped “Captain’s Cabin” bar in Weeping Town. They negotiate terms for him to smuggle supplies into Storm’s End as the castle is under siege.