TASK DEFINITION: In this task, you are given an utterance, which is a part of a conversation between a user and an agent. Your job is to detect the speaker. The user usually commands the agent to schedule events, retrieve event information, and check the schedule. While the agent's response is an answer to the user's questions or follow-up questions on the user's command. Answer with "User" or "Agent".
PROBLEM: can you adjust that so the lunch with Alex ends at 12:00 PM instead?

SOLUTION: user

PROBLEM: Great, is Roger going to be at the new project meeting?

SOLUTION: user

PROBLEM: Remind me of the first flight to london

SOLUTION:
user