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: Of course, the address is 191 Histon Road Chesterton. Would this restaurant work for you? Sentence2: The Acorn guesthouse is located at 154 chesterton road, the postcode is cb41da, and the phone is 0122335388. Shall I book a room for you? Sentence3: I want one that serves Chinese food, one that's in the same area as the acorn guesthouse. Sentence4: Thank you so much, have a great day. Sentence5: That will be fine can I get the information for them please. Sentence6: Can I help you with anything else? Sentence7: I would like to stay in the north area and I have a moderate price range. Do you think you can help me? Sentence8: I need to find a hotel to stay at that has a 4 star rating and includes free wifi. Sentence9: Ok, there is acorn guest house as well as 5 others for you to choose from. Sentence10: Not yet, I'm also looking for a place to eat Chinese food. I need it in the moderate price range as well. Sentence11: I have many options for you! Is there a certain area you need, or a certain price range? Sentence12: I have many options. do you have a preference for parking? Sentence13: Yes, that's perfect. Thanks for your help. Sentence14: I have 4 options available. 3 are in the centre and 1 is in the north. Do you have a preference? Sentence15: I need the address please Sentence16: the golden wok is the only one. When would you like the table and for how many? Sentence17: That's all I need, thanks so much for your help! Have a great day! Sentence18: Yes, I would like free parking. Question: Who has spoken the sentence 17? (A) User (B) System
Answer: (B) System