You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Yes please get me 5 tickets for that Sentence2: I need to leave on saturday and arrive by 18:30 Sentence3: I'd love to have some Indian food. Sentence4: TR0545 can get you there by 16:43, would you like me to book a ticket? Sentence5: Yes, please! Can you make a reservation at your favorite for the same group of people at 21:00 on the same day as the train? Sentence6: There are 70 results. Is there a certain day and time you'd like to leave? Sentence7: enjoy your stay in cambridge Sentence8: There are 9 restaurants in the west that are considered expensive. You have a choice of Thai, Indian, British or European. Which do you prefer? Sentence9: Thank you very much. Sentence10: I need a train from stevenage to cambridge Sentence11: Booking was successful, the total fee is 51.2 GBP payable at the station . Reference number is : DZN9X4BU . Is there anything else I can do for you? Sentence12: Yes, I'm also looking for an expensive restaurant in the west. Sentence13: Ok, I've booked you and your guests for Saturday at Tandoori Palace, 68 Histon Road Chesterton, Reference # 170ZCNIC . Sentence14: There are 5 Indian restaurants that meet your needs. Would you like for me to make a reservation for you? Question: Who has spoken the sentence 11? (A) User (B) System
A:
Answer: (B) System