The standard response to “Thank you” is “You’re welcome”.
Some people use alternatives. Petro-Canada has their employees reply with “My pleasure”.
The issue: I have applied to Petro-Canada and have been speaking with a manager about hours. Because of a teacher’s strike, teenaged employees have not gone back to school, so no hours for me yet. After I got this information, I said thank you; the response of “My pleasure” struck me as odd.