You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Great, thanks! That is all I needed for today. Sentence2: Ok, that sounds good, lets book a room please. Sentence3: Certainly, the good luck chinese food takeaway is in the south part of town. Can I book at table for you, if so how many will be dining. Sentence4: It has been my pleasure. We hope you enjoy your time here in Cambridge and feel free to contact us if you need any further assistance. Sentence5: Thank you! I am also searching for The Good Luck Chinese Food Takeaway. Sentence6: Sure thing! I just need to know what day you'll be arriving, how many nights you'll be staying, and how many people are in your party to be able to book. Sentence7: First, I need the price, phone number, and postcode there. Sentence8: I want to book a table for 2 people at 12:30 on sunday. Sentence9: Yes, the acorn guest house is a 4-star place Sentence10: The restaurant has been booked for two people Sunday at 12:30. Your reference code is COB6X9IP . Sentence11: The acorn guest house will meet your needs. Would you like to book a room there? Sentence12: Is that a 4-star hotel? I do prefer a 4-star place. Sentence13: The acorn guest house is located at 154 chesterton road postcode cb41da, phone 01223353888. The price is in the moderate range. Shall I book a room for you? Sentence14: I want to find a place to stay with free wifi. It doesn't have to have free parking though. Question: Who has spoken the sentence 13? (A) User (B) System
A:
Answer: (B) System