Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: There are four expensive Italian restaurants in the centre region: Stazione Restaurant and Coffee Bar, Clowns Cafedon Pasquale Pizzeria, and Caffe Uno. Would you like to try getting a reservation? Sentence2: There are no restaurants matching your requirements in that area. Sentence3: I'm leaving Cambridge and am looking for a train that should leave on Monday. Sentence4: I need to depart for Birmingham New Street after 20:15. Thank you so much for your help, you're doing a wonderful job! Sentence5: Where would you like to arrive? I have some arriving at london kings cross on monday. There are other arrival places also available. Sentence6: There are several. Do you have any food preferences? Sentence7: Can you give me alternate expensive restaurants in the Centre? Sentence8: Yes I would like to book for 4 people and I need the reference number. Sentence9: I would like the reservation for 14:45 for 4 people on Monday, please. Sentence10: You are now booked for Cafe Uno. Your reference number is 0CTGEFMD . Your table will be reserved for 15 minutes. Sentence11: I would like to try Caffe Uno. Sentence12: That's all I needed, thank you. Sentence13: That would be great thank you. I am also looking for halal food located in the Centre. Can you help me find one? Sentence14: You're welcome. Have a great day! Sentence15: What time would you like your reservation for? Sentence16: Would the TR2392 that arrives in birmingham new street by 23:44 be okay for booking? Sentence17: Yes, please tell me about Italian food. Sentence18: Okay there are several trains that leave after that time to the destination you listed. Would you like a reference number to one of them? Question: Who has spoken the sentence 3? (A) User (B) System
Output:
Answer: (B) System