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

Example Input: Sentence1: I don't care when I arrive, but I need to leave after 10:00. Sentence2: Perfect, thanks so much for your help. Sentence3: Yes. Wednesday please. Sentence4: I have successfully make a booking for 5 on that train. Sentence5: Sounds great. Can I get their postcode please? Sentence6: Is there anything else I can assist you with today? Sentence7: Can you find me a train from Stansted Airport? Sentence8: Alright, thanks for contacting Cambridge TownInfo centre! Have a good day. Sentence9: TR0467 leaves the airport at 10:24. Would you like tickets for that train? Sentence10: No that is everything. Have a good day. Sentence11: Queen's college is an excellent choice. Sentence12: The postcode for Queen's College is cb39et. And the reference number for your train (booked earlier) is WMUC700A . Sentence13: Can I have the reference number please? I'm also looking for some places to go, maybe a college in the west. Sentence14: Not a problem. Any day in particular? Sentence15: There are plenty of options. Where will you be arriving and do you have a time preference? Sentence16: Yes, for five please. Question: Who has spoken the sentence 14? (A) User (B) System
Example Output: Answer: (A) User

Example Input: Sentence1: We have nine expensive dining establishments on the west side. Cuisines offered are Thai, Indian, European, and British. Do you have a preference? Sentence2: Thank you. Can you please give me the reference number? Sentence3: The reference number is 5WHDPGHW .. Is there anything else I can assist you with? Sentence4: Okay I booked a table for 4 at 15:00 on Saturday at the Graffiti, an expensive British restaurant in the west area of town. Sentence5: I am interested at eating at an expensive place in the west part of town. Sentence6: No that will be all. Thank you so much for all of your help! Sentence7: Excellent. Have a good rest of your day! Sentence8: No I don't have a preference. I want to book for four people at 15:00 on Saturday. Question: Who has spoken the sentence 5? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: These are several selections available to you. Let me know which choice you have made and I will make the required booking for you. I can recommend Marriott but the Cambridge Belfry is cheaper. All three close to all of our attractions and all the main restaurants. Sentence2: tuesday and I would like to get there by 13:15 Sentence3: Can you help me find a train departing cambridge going to bishops stortford? Sentence4: Yes, that would be great. I'll need to know the price and departure time please? Sentence5: The closest I can get you to 13:15 is 12:07 and that will be TR4041. Does that work for you? Sentence6: I am happy to assist you, what date and time will you need? Sentence7: That train departs at 11:29. The cost is 10.10 pounds. Would you like me to book it for you? Sentence8: No thank you, I do need a place to stay though, I want a nice 4 star place with free wifi, please. Question: Who has spoken the sentence 3? (A) User (B) System
Example Output:
Answer: (B) System