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: Have a great time. Sentence2: University Arms Hotel sounds just great. Please get me a booking for 8 people staying for 4 nights starting from Friday. Sentence3: Do they have free wifi and a 4 star rating? Sentence4: I was able to book your rooms at University Arms Hotel for Friday. Your reference number is 8IITDH5T . Is there anything else I can do for you? Sentence5: Okay, Downing College is on regent street. The post code is CB21dq. It's free. Sentence6: Can you help me find a guesthouse? Something nice. And somewhere upscale on the price, too. My parents are paying for the whole trip and they're loaded. Sentence7: How about the express by holiday inn cambridge in the east side of town? Sentence8: No, please pick one. Provide me with the address, post code and entrance fee. Sentence9: There are a few colleges in the centre. Do you know the name of the college or do you prefer free entrance fees? Sentence10: In the centre please. Can I get their address, phone number, and entrance fee? Sentence11: Does it have free wifi? Sentence12: Sure we have 18, do you have an area preference? Sentence13: I am going off to college soon and want to visit a campus. Can you help me find one? Sentence14: Unfortunately, the colleges in town do not offer free wifi. They do offer free entrance though. Sentence15: They have free WiFi but their rating is 2. I think University Arms hotel will suit you better in that case. Sentence16: No, that's it; thank you for your help. Question: Who has spoken the sentence 13? (A) User (B) System
Answer: (B) System