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: I will be leaving on a desert trip that will go from the 3rd until the 8th.
Example Output: user

Example Input: Sounds like the 2nd one is best
Example Output: user

Example Input: The event matching "softball" tomorrow is at 12:00 PM.
Example Output:
agent