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 Input:
add make dinner to my calendar tomorrow

Ex Output:
user


Ex Input:
Am I going to piano lessons on Tuesday with Rick?

Ex Output:
user


Ex Input:
Change my meeting tomorrow to last 90 minutes

Ex Output:

user