Given the task definition and input, reply with output. 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".

Block out the entire week of Derby as out of office. Derby is on May 4th this year. Block out from 8 am on that Monday to 5 pm that Friday

user