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

Sentence1: I am looking for a train that will depart from Norwich on Sunday Sentence2: Sure thing! Your table is reserved. Your reference number is OY2LNXFW . Is there anything else I can assist you with today? Sentence3: I am traveling to Cambridge and would like to find a local restaurant. I want to arrive by train at noon. Sentence4: TR4202 is the one that leaves at 7:16 and it costs 14.08 pounds per ticket. Would you like me to book it for you? Sentence5: No, that will be all. Thanks! Sentence6: Hi there, let's start with the train arrival, where would you be travelling from? Sentence7: How about 7:16? What is the price? Sentence8: The copper kettle will be fine. Yes please book a reservation. Sentence9: Goodbye and have a good day. Sentence10: Yes that would be great. I am also looking for a place to dine for the night. Do you have any suggestions? Sentence11: Is the restaurant moderately priced? If so, please book a table for 5 at 18:00 and send me the reference number. Sentence12: My recommendation would be the Ugly Duckling, a Chinese restaurant in the centre of town. It is located at 12 St. Johns Street City Centre. Sentence13: No, I'm sorry the ugly duckling is in the expensive price range. The copper kettle serves british food and is moderately priced. Would you like a reservation for it? Sentence14: There are trains every hour on the :16 that will get you there by noon, beginning at 5:16. Which would you prefer? Question: Who has spoken the sentence 12? (A) User (B) System
Answer: (A) User

Sentence1: Hi, I just had a fight with someone regarding an automobile accident we had and I need to contact the police! Sentence2: I have the parkside cambridge police telephone 01223358966. Sentence3: always welcome. at your service Sentence4: Thank you, Goodbye Sentence5: I'm not sure where you are, but the police postcode is CB11JG. Sentence6: Can I get the zip code or postal code for the area I'm in right now? Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System

Sentence1: I believe that will be the case. Anything else I can help you with? Sentence2: It looks like that day and time are full. Is there another day or time slot you would like to try? Sentence3: Just the postcode for the Cambridge and Country Folk Museum, please. Sentence4: Yeah, I need a place to go. I want to go to the museum and it should be in the west area. Sentence5: I was able to book the table for your party of eight at 16:00. The reference number is RLTOT7X2 . Can I help you with anything else? Sentence6: I have successfully booked your taxi. You will be riding in a blue BMW. The company's contact phone number is 07883192583. Would there be anything else I could help with? Sentence7: Yes, please. I need a table for 8 on Thursday at 17:00. Sentence8: The postcode is at cb30aq Sentence9: Is there a specific time you would like the taxi to arrive at the restaurant or museum? Sentence10: You're welcome! Have a nice day. Goodbye. Sentence11: No that will be all I need, thanks. Sentence12: Thank you. I also need a taxi to get between the restaurant and the museum. Sentence13: There is a Museum of classical archaeology on sidgwick avenue for free, and a Cambridge and Country Folk Museum located at 2-3 castle street for 3.50 pounds.There are also several free galleries in the area. Can I give you more information on any of these? Sentence14: Where can I find a Vietnamese restaurant in West Cambridge? Sentence15: I want to make sure that it will arrive by 16:00. Can you please confirm? Sentence16: How about a table for 8 on Thurday at 16:00 Sentence17: There is one vietnamese restuarant in the west area, thanh binh. Can I book a table for you, if so how many will be dining? Sentence18: By 16:00 and I need the contact number and car type please. Question: Who has spoken the sentence 4? (A) User (B) System

Answer: (A) User