Conversation so far:
When did Atomic Kitten's international breakthrough occur?
During January and February 2003, Atomic Kitten toured Southeast Asia
Where did Atomic Kitten travel?
During January and February 2003, Atomic Kitten toured Southeast Asia, visiting Singapore, Thailand, and Korea

Question: when did the tour end?
Self-contained rewrite: when did Atomic Kitten's Southeast Asia tour end?