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: Thank you! You've been very helpful
Example Output: user

Example Input: The "Meeting with Ana and Damon Straeter" is on December 5th from 11:00 to 11:30 AM.
Example Output: agent

Example Input: Yes, I found 2 events between Sunday the 12th and Tuesday the 14th. The first is "West Coast Swing" from 7:30 PM to 8:00 PM.
Example Output:
agent