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: Change the Date from 27 Jan to 28 Jan
Example Output: user

Example Input: Can you schedule me a meeting with Fiona Mason and Karl Boon tomorrow from 2 pm - 4 pm?
Example Output: user

Example Input: Fabian can no longer come to the video game meetup.
Example Output:
user