Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: I need to leave after 17:45 so anytime after that would be great. Sentence2: When would you like to arrive? Sentence3: I have train TR7355 from Cambridge departing at 17:50 and arriving in Ely at 18:07. Would this train work for you or would you like a later departure? Sentence4: Sorry. I really need to be leaving from Cambridge to go to Broxbourne, leaving after 17:45 on Thursday. Arrival time doesn't matter. Sentence5: Sure, do you still need the train on Thursday after 17:45? Sentence6: I apologize this train is going to broxbourne from cambridge. for 3 people are you able to book that? Sentence7: I have 10 trains to Ely Thursday, leaving on the :50 every two hours from 05:50 to 23:50. Did you have a particular time in mind? Sentence8: That's great. I'll need 3 tickets, please. Sentence9: I need a train that leaves this Thursday from Cambridge to Ely. Sentence10: Booking was successful, the total fee is 13.2 GBP payable at the station. Reference number is : WDETDX35 . Sentence11: Yes, that's Broxbourne to Cambridge on Thursday, leaving after 17:45. Sentence12: How about TR9890? It departs Cambridge at 18:01 and arrives in Broxbourne at 19:01. It is 17.90 pounds per ticket. Would you like to book that one? Sentence13: Yes, please. I will need the reference number when you are finished. Sentence14: Your booking was a success. The total fee for 3 tickets is 53.70 GBP, payable at the station, and your reference number is TSUJXVYU . Is there anything else I can do? Sentence15: Thank you, good bye. Sentence16: No that will do , cheers. Question: Who has spoken the sentence 8? (A) User (B) System
A:
Answer: (A) User