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: Create an appointment with my dentist on Friday noon
Example Output: user

Example Input: Yeah is it
Example Output: user

Example Input: You have one event on your calendar. Your "ask for a raise" is tomorrow from 10:00 to 10:30 AM.
Example Output:
agent