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: Yes. Also change the ending time for the event to 2 PM
Example Output: user

Example Input: Make a appointment for 9:00 to 9:30 AM. tomorrow
Example Output: user

Example Input: Schedule Lunch with Jesse and Bill today starting at 12 and ending at 1PM.
Example Output:
user