Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Thank you. You have bee very helpful. Have a nice day. Sentence2: I have 4 options here. I suggest adc theatre at park street. Is there anything else I could help you with? Sentence3: Are there any theatres to go to in the centre of town? Sentence4: Sorry it leaves at 09:16 and arrives at 10:35. Sentence5: Yes you are correct train TR5225 arrives at 13:35. Sentence6: Wait, I thought it arrived at 13:35, no? Sentence7: Sure, when would you like to leave? Sentence8: Yes perfect. What is the departure time on that train so I am not late. Sentence9: you are welcome, enjoy your stay. Sentence10: I need a train to cambridge from norwich on Sunday, please. Sentence11: Can you verify the departure time for that train again please? Sentence12: I need to arrive by 14:30, is there anything for that time? Sentence13: Yes can I get the address and fee and number for the theatre? Sentence14: Unfortunately there are no such venues. Can I help you with anything else? Sentence15: It's located on park street, postcode cb58as and their phone number is 01223300085. Unfortunately, their entrance fee is not available. Sentence16: The departure time is 12:16 PM Sentence17: TR5225 arrives at 13:35 if that would work for you? Sentence18: Thank you. I am also looking for a place to go in town. I'd like it to be located in the centre and be a mutliple sports Question: Who has spoken the sentence 11? (A) User (B) System
Answer: (B) System