You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: The train should go to Cambridge on Thursday. I would also need the train ID. Sentence2: Area does not matter, Ill go with anyone that you recommend, please book me for thursday at 19:15 for 6 people. Sentence3: I have several options for you. Do you have a certain area in mind? Sentence4: That sounds like the one I need. I'll reserve it myself though. Thanks for your help, I won't need anything else. Bye. Sentence5: Do you need any suggestions for attractions or hotels? I can help. Sentence6: Ok, you have a reservation at the Ugly Duckling. The reference number is MHERLSWD . Do you want the address? Sentence7: Where will the destination be? Sentence8: I have no preference, I just need to arrive by 14:15 Sentence9: I have TR4836 available. It leaves at 13:11 and arrives at 13:58. The cost is 9.80 pounds. Would you like this one? Sentence10: When would you like to leave at? Sentence11: No need for the address, thanks so much. I also need a train departing King's Lynn. Sentence12: I am leaving on Thursday and would like to arrive by 14:15. Sentence13: OK, what day are you traveling, and at what time? Sentence14: Please help me find an expensive restaurant that serves Chinese food. Thank you. Question: Who has spoken the sentence 1? (A) User (B) System
A:
Answer: (B) System