Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: I am looking for an expensive restaurant. Sentence2: Yep, headed to Cambridge on Tuesday. Sentence3: Will you be traveling to Cambridge on the train? And if so, what day would you like to travel? Sentence4: I'm sorry, there are no restaurants in the centre that serve austrian food, would you like to try another area? Sentence5: No, thank you. Can you tell me the Train ID, please? Sentence6: I also need a train that departs from Stansted airport after 09:15. Sentence7: Can I just get the contact information for La Mimosa for right now? Sentence8: That's ok, thank you for your help. Sentence9: That is all thanks. Sentence10: There are two la mimosa and shiraz restaurant, I recommend la mimosa would you like me to book it for you? Sentence11: Do you have any restaurants that serve Mediterranean food? Sentence12: Certainly. The train ID is TR1610. Is there anything else I can do for you? Sentence13: There is a train leaving at 9:24 and arriving in Cambridge by 9:52. Would you like me to book that for you? Sentence14: Thank you for contacting us and have a ncie day. Sentence15: I'm looking to dine at a restaurant in the centre that serves Austrian food. Can you help? Sentence16: No problem, the Phone number is 01223362525. Postal code is cb58aq, Address is Thompsons Lane Fen Ditton. Is there anything else i can help you with? Sentence17: Is there anything further I can help you with today? Sentence18: There are three mediterranean places in the centre area, any price limitations? Question: Who has spoken the sentence 12? (A) User (B) System
Output:
Answer: (A) User