Kowalski said that he headed to New Orleans to meet his girlfriend at Mardi Gras only to find her while walking down the street, holding hands with another woman that looked at first like a hairy man. However, that was as far as he got in the story after Mission Control ordered an emergency mission abort upon learning about the debris field heading right for them.
Later on in the film, Dr. Ryan Stone attempted to get Kowalski to finish the story to confirm that he was still alive. However, Kowalski never responded, meaning that he died from hypoxia in his spacesuit. Stone was forced to realize that she was the sole survivor of the Explorer.