In this task, you are given a dialogue from a conversation between an agent and a customer. Your task is to determine the speaker of the dialogue. Answer with "agent" or "customer".

Input: Consider Input: Do you have any time concern?

Output: agent

Input: Consider Input: Sorry Thomas, there are no flights available on your requested dates.

Output: agent

Input: Consider Input: Can you please help me to book a flight from JFK to HOU?
Output: customer