Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: the reference number is 9g1eycif . Sentence2: The abbey pool and astroturf pitch is located at pool way, whitehill road, off newmarket road. Do you need anything else? Sentence3: I'm looking for an attraction in the category of swimming pool. Sentence4: That is all I need. Thank you for your help! Sentence5: Yes, west, east, south and north. Sentence6: Could you book rooms for 7 people for 4 nights starting from Saturday? Sentence7: I will need the reference number. Sentence8: Yes, I'm also looking for a guesthouse in a moderate price range. Sentence9: I've got four pools for you. What area are you in? Sentence10: The area doesn't matter, but it should have 4 stars please. Sentence11: What area would you like to stay in? Sentence12: I'm pretty open. Can you list the areas? I'll choose one of the four. Sentence13: The acorn guest house is awesome. I would suggest that place. Sentence14: Please tell me about the locations of some pools in the south. Sentence15: One in the east is fine. I need the address please? Sentence16: I am sorry but there are none in the south. I have one east, two north and one centre. Sentence17: No problem. Enjoy your stay. Sentence18: I have you booked for 4 days. What else can I do for you? Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System