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

Sentence1: Hello! I'm looking for a train arriving by 10:30 to cambridge. Sentence2: Can you tell me what the travel time is and the price? Sentence3: That's train TR6180. The travel time is 105 minutes, and the cost is 37.80 pounds per ticket. Sentence4: Great. I'm glad I could help you with that. Have a nice day. Goodbye! Sentence5: I am departing from leicaster and it will be on thursday Sentence6: Which train would you like that for? Sentence7: 9:54 sounds good. What is the price? And how long is the trip? Sentence8: Four trains will get you there by 10:30. Would you prefer to depart at 6:54, 7:54, 8:54 or 9:54? Sentence9: The 8:09 departure, please. Sentence10: That are several options that arrive in Cambridge by 10:30. When are you traveling and where are you departing from? Sentence11: Thank you. That's all I needed today. Sentence12: I beg your pardon, but the times I mentioned earlier were for arrival rather than departure. The departure times are 5:09. 6:09. 7:09, and 8:09. What is your preference? Question: Who has spoken the sentence 11? (A) User (B) System
Answer: (B) System