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: Ok who will be joining me for lunch?
Example Output: user

Example Input: I've changed "Project Planning" to be Lindsay, Dan Schoffel, and Sarah.
Example Output: agent

Example Input: please help me check if benihana's in hoffman estates is family friendly
Example Output:
user