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: Will it snow on Halloween?
Example Output: user

Example Input: Schedule a meeting at 10 am on Friday.
Example Output: user

Example Input: Yes. The chance of rain will be 0.00 % on Sun, October 28.
Example Output:
agent