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: i dont care about the area Sentence2: What area of town would you like to stay in? Sentence3: is that a guest house? Sentence4: Sure thing, I would suggest the acorn guest house. Sentence5: No, I really want a guesthouse. What about something in the moderate price range? Sentence6: I don't have any guesthouses available that meet your criteria. Would you be willing to stay in a hotel? Or can we search using different criteria? Sentence7: no, it's listed as a hotel. do you need a guesthouse? Sentence8: in what area do you prefer? Sentence9: sure, do you need a train to get here? Sentence10: TR8331 leaves at 11:11 and arrives 11.58. can i book this one for you? Sentence11: And do you have a preference on the number of stars the establishment should have? I see both 3 and 4 star options. Sentence12: I do not have a preference on area. Sentence13: I am looking for information in Cambridge Sentence14: Are you on a budget? Sentence15: There are 14 guesthouses in the city that meet your criteria. Let's see if we can narrow it down a little. Do you need internet or parking? Sentence16: Alright, the total fee is 29.4 GBP payable at the station. The reference number is: 3LS7FBU8 . Anything else I can get you? Sentence17: i don't care, i already told you that. Sentence18: Yes, I am also looking for a place to stay. The hotel should include free wifi. Sentence19: No. I would prefer something expensive and with free wifi. Sentence20: Yes please, I need 3 tickets and the reference number. Sentence21: We have lots of hotels! Any part of town you'd prefer? Sentence22: Okay, how about the University Arms Hotel? Sentence23: Thank you for calling our service today. Please let us know if we can assist you with your future needs. Goodbye! Sentence24: The hotel should include free wifi. Sentence25: I would prefer a four star can you send me some info on that? Sentence26: No. Thanks you. That's all. Goodbye Sentence27: Give me their area and address Sentence28: The Acorn Guest House is located in the north part of the city and their address is 154 chesterton road. Anything else for you today? Sentence29: Yes, on tuesday from kings lynn, leaving after 10:30 please? Sentence30: Yes please. Question: Who has spoken the sentence 16? (A) User (B) System
Answer: (A) User