The Office S03E13 - Traveling Salesmen

Dwight arrives late for an early morning meeting, where Michael announces that the members of the sales staff are teaming up for sales calls, in an Amazing Race-esque challenge. Andy spends the day trying to convince Michael that Dwight is untrustworthy. Meanwhile, Kevin announces to Angela that their sales reports weren't mailed to New York, but Angela assures him that the problem was handled. When the teams return, Andy discovers that Dwight's morning tardiness was due to delivering the reports to New York for Angela. Dwight, instead of revealing their relationship, resigns his position.