You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Acorn Guest House is located at 154 Chesterton Road. Sentence2: How many stars does the Acorn Guest House have? Sentence3: No, unfortunately there are no guest houses that offer free parking but do not offer free internet. Sentence4: Is there any other guesthouses that don't have internet included? Sentence5: Okay, what about one that does have internet? Sentence6: I am also looking for a train that leaves after 14:15. Sentence7: What is the address of the Acorn? Sentence8: I think your best bet is Acorn Guest House. They fulfill your need for free parking and are in the north. Sentence9: Sure thing, Reference number is : A4C2KF23 . Anything else I can help you with? Sentence10: I need a guesthouse, free parking included. Sentence11: ok, the acorn guesthouse is a great place. Located in the north and is moderately priced. They offer free parking and internet. Sentence12: The Acorn Guest House is rated 4 stars. Sentence13: Could you please book that train for 5 people and give me the reference number. Sentence14: It was a pleasure to assist you. Thanks for using our service. Have a great day. Goodbye. Sentence15: That will be all, thank you. Sentence16: TR2420 train leaves at 15:00, may I book this for you? Question: Who has spoken the sentence 4? (A) User (B) System
A:
Answer: (A) User