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: Okay. Glad I could help. Enjoy your dining experience. Sentence2: No, that's all I needed. Have a nice day. Sentence3: Is one of them cheap? Sentence4: I have listings for two. What price range are you looking for? Sentence5: I have 3, charlie chan, rice house or golden house. Would you like me to book one for you today? Sentence6: Thanks so much. Have a great day! Sentence7: Yes, La Raza is a cheap priced Spanish restaurant in the centre. Would you like me to make a reservation for you? Sentence8: Were you able to find anything? Sentence9: Yes, please make a reservation for Thursday at 16:15. There will be 7 of us. Sentence10: Yes I will look for different restaurant. Sentence11: I want to find a place serving spanish food in the centre of town. Sentence12: Okay yes pick one, perhaps the Golden House. Sentence13: Can you look for chinese restaurants please. Sentence14: Thank you for using our service, and enjoy your time in Cambridge! Sentence15: The booking was successful. Your reference number is C3NR2DW2 . Is there anything else I can help you with today? Sentence16: Could you please check for a different restaurant in the same area and pricerange. Sentence17: We do not have another Spanish restaurant. Would you like chinese or italian perhaps? Sentence18: I was unable to book this restaurant. would you like to try another one? Question: Who has spoken the sentence 9? (A) User (B) System
Answer: (B) System