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 weather will be in riga tomorrow?
Example Output: user

Example Input: Do I have anything tomorrow at 4pm?
Example Output: user

Example Input: I've put that on your calendar on Thursday from 10:00 to 10:30 AM.
Example Output:
agent