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: The event with Abby is on Sunday the 20th at 8:00 AM.
Example Output: agent

Example Input: Do I have time to go to the gym today?
Example Output: user

Example Input: What is scheduled today after 1?
Example Output:
user