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

Sentence1: Thanks! I also need help finding a train leaving friday arriving by 21:15. Sentence2: The Milton Country Park has free admission. They are located on the North and the phone number is 01223420060. Sentence3: Booked! The price is 10.1 pounds to be paid at the station. Reference number: 2CDCW6I7 . Sentence4: I want to find a park to visit in town. Sentence5: Thank you and have a good trip. Sentence6: Fantastic. Thank you very much for all of your assistance. Sentence7: I need to go to Cambridge, from Stansted Airport. Sentence8: TR5694 leaves at 09:24 and arrives at 09:52 giving you plenty of time. Can I book you a ticket? Sentence9: I have train TR3342 ariving at 21:01. Sentence10: Yes please, a ticket for one, and may I also know the price? Sentence11: I don't really care, just pick one and give me the phone number please. Sentence12: There are 5 parks around town. What part of town would you prefer to visit the park in? Question: Who has spoken the sentence 11? (A) User (B) System
Answer: (B) System