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: Am I going to piano lessons on Tuesday with Rick?
Example Output: user

Example Input: How about the rating for Sanctuary in Iowa City?
Example Output: user

Example Input: Yes, I found one event named "team meeting" this week. It's from 10:00 to 10:30 AM.
Example Output:
agent