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: I think you'd like TR8842 train, it costs 23.60 pounds. Sentence2: Thanks, it would be helpful if you also told me what time TR8842 leaves. Anyhow, I just got paid. Can you find me a high-end eatery serving European cuisine? Sentence3: No thank you. I'll just need the address for an expensive restaurant that serves European food. Sentence4: Train TR8842 leaves london kings cross at 15:17 on friday and arrives at cambridge at 16:08. Can I provide you more information or book it for you? Sentence5: Arrival time is not important. I just need to leave after 14:15. I will need the train ID and the price, please. Sentence6: Sorry! As I said, it's at Free School Lane City Centre. Can I help you with anything else? Sentence7: Hi, could you help me find a train going to Cambridge? Sentence8: Is there a time you would like to arrive by? Sentence9: Where and when are you departing from? Sentence10: I would like to leave on Friday Sentence11: No, that's it. Thank you. Sentence12: which side of town is most appropriate for you? Sentence13: Have a lovely day, goodbye. Sentence14: I am leaving from London Kings Cross after 14:15. Sentence15: I'm sorry, but I think you gave me the phone number. I need the address, please. Sentence16: I don't have a preference really, please recommend one. Sentence17: no. i just need the address Sentence18: What day would you like to leave? Sentence19: its address is 01223368786. is that it? Sentence20: How about the eraina located at Free School Lane City Centre. Would you like reservations? Question: Who has spoken the sentence 4? (A) User (B) System

Output: Answer: (A) User

Input: Consider Input: Sentence1: Can you verify that the hospital has a transplant high dependency unit? Sentence2: Can you help me find a hospital nearby? Sentence3: Yes, it does. Here is the unit's phone number: 01223216811. Do you need any other information? Sentence4: I would like the address and phone number please. Sentence5: No that is everything. Thank You Sentence6: Sure, the phone number is 01223245151 and the address is Hills Rd, Cambridge. Sentence7: The nearest hospital to you is at Hills Rd, Cambridge. would you like their phone number? Sentence8: Alright sounds good. I hope everything is okay. Question: Who has spoken the sentence 4? (A) User (B) System

Output: Answer: (A) User

Input: Consider Input: Sentence1: Good morning! I'm trying to buy a train ticket that goes from Peterborough to Cambridge. Can you help me do this? Sentence2: Yes please. I need 5 seats. Sentence3: The train should leave on Sunday and should arrive by 16:45 Sentence4: No, I'm sorry, that's much too early. Could you find one closer to 16:00 or 16:20? Sentence5: The latest train departs at 15:48. Does that work for you? Sentence6: I have a train arriving at 08:09 that leaves at 07:19? Sentence7: There is the Man on the Moon in the Centre located at 2 Nofolk St. Their phone number is 01223474144 Sentence8: Booked! At the station you will pay 66 pounds. Reference number: JQ91RH6X . Sentence9: Sure, how about one that is in the type of entertainment? Sentence10: Okay, have a good day as well. Sentence11: I don't see anything in that area. Can I search a different area or venue for you? Sentence12: Thank you for all your help today. Have a great day. Sentence13: Can you give me the postcode and entrance fee? Thanks. Sentence14: I don't have the entrance fee, but the postcode is cb12lf. Sentence15: 16:38, fifty minute travel time. Shall I book it? Sentence16: Great I also need to find a concerthall to visit in the south. Sentence17: I can absolutely help! Do you have a specific day and arrival/departure time? Sentence18: For the one that departs at 15:48, what time would I arrive? Question: Who has spoken the sentence 2? (A) User (B) System
Output: Answer: (A) User