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: Extend it by another 15 minutes.
Example Output: user

Example Input: Add watch QVC Thursday night from 5:15p to 3am
Example Output: user

Example Input: Eann is the organizer of "Pick-Up Laptop".
Example Output:
agent