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".

Example Input: What days are marked as out of office for April?
Example Output: user

Example Input: Will it rain during the marathon friday?
Example Output: user

Example Input: The last event on Saturday is "last" from 10:00 to 10:30 PM.
Example Output:
agent