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

Example 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
Example Output: Answer: (A) User

Example Input: Sentence1: Thank you for using our system today! Sentence2: I am coming to cambridge and heard about a bed and breakfast called finches. Sentence3: Yes, I would like to arrive before 5:00 PM. Sentence4: It is a lovely guesthouse on the west end boasting cheap prices and a 4 star rating! Would you like their address or phone number perhaps? Sentence5: I actually would like to book the hotel for 7 people starting on Tuesday for 3 nights. Sentence6: I'll be departing from cambridge and going to norwich. Sentence7: I apologize, I actually need to leave after 16:30 Sentence8: No problem, but I'm afraid there are no trains leaving after 16:30 and arriving by 17:00. Might I suggest TR7047, which leaves Cambridge at 16:36 and arrives in Norwich by 17:55? Sentence9: Is there a time you would like to arrive before? Sentence10: Can you also help me find a train on Fridya? Sentence11: Train TR7747 leaves at 15:36 and arrives in Norwich at 16:55. Would you like me to book you tickets? Sentence12: Thank you, no that will be all. Sentence13: OK, the booking for successful. The total is 17.6 GBP and the reference number is MIMOPEN1 . Is there anything else I can do for you? Sentence14: Yes, that sounds great. Please book that for me. Sentence15: I was able to book your party of 7 at Finches bed and breakfast for 3 nights. Your reference number is 4R76GWVJ . Can I help you with anything more today? Sentence16: Of course. There are many available Friday. Where will you be traveling to and from? Question: Who has spoken the sentence 7? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: It will be dinner for 5 people. Sentence2: Anywhere is fine, it just needs to be moderately priced. Sentence3: I am interested in finding local Indian restaurants to visit during my trip to Cambridge. Sentence4: No actually I don;t need a reservation. I just need to find a hotel that is a guesthouse with free parking, and in the east and moderately priced. Sentence5: There are 24 guesthouses to stay at around town. What area of town and price range are you looking for? Sentence6: I also need a place to stay and should be a guesthouse Sentence7: Okay. Then I recommend curry prince in the east. Would you like a reservation there? Sentence8: I have four indian restaurants. Do you have a area of town in mind? Sentence9: Sure! How many people, what time, and what day? Sentence10: No, I only need one. Sentence11: Do you need to cancel the booking? Sentence12: Do you have a price range in mind? Sentence13: I have 4 at that price. 2 in east, 1 each in north and west. Any preferences? Sentence14: Can you make a reservation for me, please? Sentence15: Of course! What time would you like to dine? Sentence16: Have a nice day. Sentence17: No, any is fine really. Sentence18: It is in the East section of town. Sentence19: Moderate price range, please. Sentence20: you have a booking already for the Autumn House are you wishing to book another guesthouse? Sentence21: Booking your reservation was successful and your reference number is 47TOYZUY . Have you decided in which part of town you want me to find an Indian restaurant? Sentence22: 5 people and 4 nights. Sentence23: Okay, I recommend Autumn House. For the reservation on Friday, how many people will be staying and for how many days will you be staying? Sentence24: then Booking was successful.Reference number is : 47TOYZUY . Sentence25: There a 6 guesthouses in the east. Half of them are in the cheap range, and the other half moderate. What is your preference? Sentence26: I only need one booking. Sentence27: The price doesn't matter. But I need a reservation starting on Friday. Sentence28: thanks for your help. have a great day Sentence29: I am looking for a hotel in the east. Sentence30: Not yet. What part of town is it in? Question: Who has spoken the sentence 15? (A) User (B) System
Example Output:
Answer: (B) System