You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Actually, I'd like some information about an attraction in the centre dealing with multiple sports. Sentence2: I'd like some information about the University Arms Hotel. Sentence3: I could not find any attractions for multiple sports in the centre of town. Is there perhaps another attraction type or area of town I could search for you? Sentence4: No I just needed to know the information. Thank you, that's all I needed. Sentence5: There are 5 colleges in the centre. Corpus Christi or Downing College are very nice. Would you like more information about one of them? Sentence6: Yes, it is a hotel. Any other questions that I can help with today? Sentence7: I never got the address for Corpus Christi College. Could you give that to me? Sentence8: Great, and what is the address? Also, can I just confirm that University Arms Hotel is actually a hotel? I don't like guest houses. Sentence9: Sure, their phone number is 01223338000. There will be an entrance fee of 2 pounds. Sentence10: Yes that's everything, thank you. Goodnight. Sentence11: If I can just get the address of the University Arms Hotel please. Thanks. Sentence12: Have a great visit and please call back if you need additional help. Sentence13: Sure, the address listed for University Arms is regent street, postcode cb21ad. What else can I help with today? Sentence14: Can you give me the phone number and address for Corpus Christi College? Sentence15: Thank you for contacting the Cambridge TownInfo centre. Goodbye. Sentence16: How about a college in the same area? Sentence17: Certainly! The address is king's parade, is that all you needed? Sentence18: sure. it is 4 stars and expensive. they have internet, free parking & located in the center on regent street. phone number 0122331241. shall i make a reservation? Question: Who has spoken the sentence 13? (A) User (B) System
Answer: (B) System