Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: No thank you. Sentence2: Okay and what day would you like to travel? Sentence3: I need to take a train to Cambridge after 09:30. Sentence4: sure, what station are you leaving from? Sentence5: train TR2987 meets all your needs. Shall i book it for you ? Sentence6: Not right now, but could I have the postcode? Sentence7: The postcode is cb17dy. Is there anything else I can help you with? Sentence8: I'm also looking for a recommendation on Mexican restaurants in the south. Sentence9: Thank you for using our service! Sentence10: I will be leaving from Ely. Sentence11: Yes, please for 8 people. Sentence12: I need to depart broxbourne and travel on monday please. Sentence13: I would recommend the Chiquito Restaurant Bar. Would you like to make a booking? Sentence14: Great! Your train will leave Ely on Monday at 11:35 and arrive at 11:52. It has been booked for all 8 for a total fee of 35.2GBP, which is payable at the station. Your reference number, if needed, is PD2F8YMF . Question: Who has spoken the sentence 1? (A) User (B) System
Output:
Answer: (B) System