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: Take Damon Straeter out of the meeting with Sarah.
Example Output: user

Example Input: I need you to block off 6 hours starting at 7PM tomorrow for the Fall Out Boy Concert.
Example Output: user

Example Input: Add go to ice cream festival on Saturday from 12 to 4 pm.
Example Output:
user