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: I've changed "Meeting with Jenna and Megan Bowen" to be at 11:00.
Example Output: agent

Example Input: And who has not declined bbq party?
Example Output: user

Example Input: Creat my foot ball match on Sunday at 9 AM
Example Output:
user