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]: Yes, Steven has accepted the "golfing" invitation.
[EX A]: agent

[EX Q]: Add dinner to my calendar tomorrow night at 7pm
[EX A]: user

[EX Q]: Can you add lunch instead for 1330?
[EX A]:
user