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

Input: Consider Input: Sentence1: Sorry. TR2052 departs from leicester and the destination is cambridge. It leaves at 15:09 on Wednesday. Would you like me to book it for you? Sentence2: Yes, I only need 1 ticket for myself. Sentence3: There are 13. I could recommend Trinity College on Trinity Street. Or would you like information about one of the others? Sentence4: I would like to arrive by 17:00 in leicester. Sentence5: I would like help finding a college to visit in the centre of town. Sentence6: Of course. The address is Trinity Street, postcode is CB21TQ, and the entrance fee is one pound. Can I help you with anything else? Sentence7: Yes and please give me the reference number. Sentence8: OK, I've booked one ticket for you on TR0451 from cambridge to leicester, arriving at 16:06. Ref# 8OZNJHMO . Can I help you with anything else today? Sentence9: That sounds good. Could you give me the entrance fee, phone number, and postcode? Sentence10: Certainly. Just to verify, are you traveling alone? You would only like one ticket? Sentence11: TR3702 LEAVES AT 05:00 CAN I BOOK THAT ONE FOR YOU? Sentence12: How early do you wish to arrive? There are 11 trains that will get you there before 17:00. Sentence13: Thank you for using our service. Have a good night. Goodbye. Sentence14: Does this train go to Leicester from Cambridge? Sentence15: Yes I'm also looking for a train that leaves wednesday and arrives by 17:00. Sentence16: I think that is all I need, thank you. Question: Who has spoken the sentence 4? (A) User (B) System

Output: Answer: (A) User

Input: Consider Input: Sentence1: Taj Tandoori is an expensive Indian restaurant in the South. Would you like more information on them? Sentence2: I'm looking for an expensive restaurant in the south part of town Sentence3: Thanks for your call. Goodbye! Sentence4: Thank you goodbye. Sentence5: May I have their address and phone number? Sentence6: chiquito restaurant bar is located at 2G Cambridge leisure park cherry hinton road cherry hinton. Its phone number is 01223400170. Would you like anything else? Sentence7: Yes. chiquito restaurant bar serves mexican food in the expensive price range and is located in the south part of town. Sentence8: Is there anything else? Question: Who has spoken the sentence 7? (A) User (B) System

Output: Answer: (B) System

Input: Consider Input: Sentence1: I need a place to stay with free wifi but I don't need free parking, thank you. Sentence2: Yes, let's go ahead and book with the Avalon. Sentence3: Thank you. I am also looking for a place to eat in the centre area and that serves indonesian food. Sentence4: how about lebanese instead? Sentence5: There's actually a great Lebanese restaurant in that area, Ali Baba. Would you like me to book a table for you? Sentence6: Yes, book the table for two. Also, make it a late dinner? Sentence7: It doesn't matter as long as it's on the moderate range. Sentence8: Ok. The booking was successful and your reference number is C35XS6YE . Sentence9: I'm afraid that I didn't find any restaurants matching your criteria. Would you like to try a different type of cuisine, or a different part of town? Sentence10: Okay, I will book the table for two at a moderate restaurant. Sentence11: are there any indonesian restaurants elsewhere? Sentence12: 9 of the 10 results returned are guesthouses. What area of town would you like to stay in? Sentence13: Do you have a preference for location? I'm showing guesthouses everywhere but the city centre. Sentence14: There are none in town. Shall I try another type of food? Sentence15: I just need to find one that has room for 3 people to stay 3 nights starting from Saturday. Sentence16: Do you have any in the cheap price range? Sentence17: I am showing 2 guesthouse and 1 hotel. All are moderate price range. Would you like more information? Sentence18: the avalon is available,, would you like to book now? Question: Who has spoken the sentence 3? (A) User (B) System
Output: Answer: (B) System