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: Add Noah to the meeting
Example Output: user

Example Input: injustice. give me a look at my calendar
Example Output: user

Example Input: Yes that's awesome. and then can you alter the start of the meeting with Kim from PM to AM.
Example Output:
user