You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: The TR1828 departs Broxbourne at 17:32, arrives in Cambridge at 18:32. Would you like to book a ticket? Sentence2: Reference number is : VRSU89VK . at the price of 89.5 GBP Sentence3: There are many trains departing throughout the day, which day were you looking to leave? Sentence4: I have 13 colleges listed in the centre. Christ's college and downing college both have free admission. Sentence5: I'm also looking for a college to see in the centre area. Can you give me some matches to this criteria? Sentence6: I'm looking for information on trains from Broxbourne to Cambridge. Sentence7: You're welcome. Have a great day! Sentence8: Yes. The phone number is 01223334900 and the postcode is cb23bu. Sentence9: Christ's college sounds perfect. Can I get the postcode and phone number please? Sentence10: Tursday, leaving after 17:00, please. Sentence11: That's all I need. Thanks. Sentence12: Yes please. I would like a booking for 5 people and the reference number once the booking has been confirmed. Question: Who has spoken the sentence 1? (A) User (B) System
A:
Answer: (B) System