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".

[EX Q]: I've changed "doctor" to be named "APPOINTMENT WITH DOCTOR".
[EX A]: agent

[EX Q]: I will be planning a scary movie from 1pm till the end of the work day.
[EX A]: user

[EX Q]: The event "returning flight" is on Tuesday the 17th at 12:00 PM.
[EX A]:
agent