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 gavin this week is located at toilet.
Example Output: agent

Example Input: meeting between 1 and 3pm
Example Output: user

Example Input: Make an event after that lunch
Example Output:
user