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: I'm looking for multiple sports in the centre please. Sentence2: You're welcome. Have a nice day. Sentence3: I got 8 tickets for you the reference number is TJTTPUV3 . 132 GBP is the total and can be paid at the station when you get there. Anything else? Sentence4: I need the train for 8 people leaving from Peterborough and arriving in Cambridge before 13:00. Once you have the booking, can you send me the reference number? Sentence5: I am looking for somwhere to go in the centre. Sentence6: Absolutely! The phone number for Primavera is 01223357708. Can I help you with anything else? Sentence7: Do you have any type of museums in the centre? If you do, I need the phone number, too. Sentence8: Yes, for 8 people. I will need a reference number, thanks! Sentence9: On what day did you need the train? Sentence10: Are you looking for an attraction or a restaurant? Sentence11: I think that will be all for today. Thank you. Sentence12: There is a train that leaves at 05:19. The ID is TR1662. Would you like me to book at ticket for you? Sentence13: I need to book a train to arrive in Cambridge by 13:00. Sentence14: I have about 11 different museums. Might I suggest the Primavera. It has a large variety of excellent exhibits. They also offer free admission. Sentence15: Unfortunately, I don't have any listings for centre. How about in the east area? Sentence16: Sounds great! Could I get the phone number? Sentence17: OK, where from? And what day are you traveling? Sentence18: I would need the train on Friday. Question: Who has spoken the sentence 9? (A) User (B) System
Answer: (B) System