You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Actually, I don't want to book yet. Thanks for the information. I think that is all I need. Sentence2: I was able to book it, the reference number is O6ZSM73S . Sentence3: That is all I need. Goodbye. Sentence4: phone number is 01223365664 and postal code cb41da Sentence5: When would you like to arrive, and how many guests are in your party? Sentence6: The hotel should be in the north. Sentence7: I have 17 locations. Do you have an area of town you'd like to stay in? Sentence8: Thanks. I'm also looking for information on moderately priced hotels with free wifi. Sentence9: OK book that please Sentence10: There are plenty of trains arriving that early. Where are you coming from, and what day are you traveling? Sentence11: how about hamilton lodge? i hear they're great. Sentence12: Ok. Thank you and goodbye. Sentence13: Sounds good. Could you get me the postcode and the phone number? Sentence14: We have four early morning trains available that day, one every hour from 5:24 to 8:24. Would you like to book one? Sentence15: Is it possible to get a morning train that arrives in Cambridge by 9:15 or do you need to get there the night before? Sentence16: Yes, please! The one at 8:24 please. 1 person. Give me the reference number. Sentence17: I'll be coming in from Stansted Airport on Friday. Sentence18: Thank you for using our services. Have we met all of your needs today? Question: Who has spoken the sentence 9? (A) User (B) System
Output:
Answer: (B) System