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 my marriage event to start in the am instead of the pm
Example Output: user

Example Input: Yes it is
Example Output: user

Example Input: What availability do I have on the 15th of May for a meeting that will last approximately 2 hours?
Example Output:
user