Detailed Instructions: 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".
Problem:I have an appointment with Barack Obama so that I want to fly to CA-SFO on 12/22 from PA-PHL. I intend to return on 12/24, can you help me to book a flight ticket?
Solution:
customer