You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: That is perfect. Thank you that's all I needed today. Sentence2: Thanks so much. Could I bother you to help me find an expensive Chinese restaurant? Sentence3: I need the price for the train that leaves at 10:40 for one and the arrival time. Sentence4: The price is 75.10 per ticket and arrives at 13:23 Sentence5: I have a trip on wednesday and I need a train that departs from birmingham new street. Sentence6: TR7940 leaves at 10:40. Would you like me to book some seats for you? Sentence7: The train should depart from birmingham new street and should leave on wednesday. The train should leave after 10:15 and should go to cambridge Sentence8: Yes, please book two seats for me at 10:40. What time will it arrive in Cambridge? Sentence9: We have several. What part of town would you like it in? Sentence10: No preference. But please make sure I get the address. Sentence11: You will arrive by 13:23. I have 2 seats booked for you, and the reference number is RBQLUN8O . Is there anything else I can help you with? Sentence12: there are many that day. can you specify your destination? Sentence13: You're welcome. Have a great day! Sentence14: i recommend a place called Hakka. they are located on milton road chesterton. Question: Who has spoken the sentence 11? (A) User (B) System
Output:
Answer: (B) System