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 need to find out who Sarah's manager is.
Example Output: user

Example Input: Can you schedule a doctor appointment on February 8th at 8 am?
Example Output: user

Example Input: create meeting with barack on monday at 12
Example Output:
user