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: Buddy, show me all my appointments today.
Example Output: user

Example Input: What events are Lani and Alex going to be attending next week?
Example Output: user

Example Input: ok, check for peter's contact information
Example Output:
user