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: Awesome. Could you also help me find a restaurant in the centre? Sentence2: Train TR7850 arrives at 12:08, but that there are trains arriving earlier. Which one could you rather take? Sentence3: Wow, I cant believe that I got a person this quickly. I need a train to cambridge. I want to get there buy tuesday at 12:30. Sentence4: I can recommend the oak bistro in the centre of town, they have british food, and are in the moderate price range. Would you like to make a reservation? Sentence5: American food and I need a booking for same group Sentence6: I'll be leaving from london kings cross. Sentence7: No, you've been a great help today. Thank you. Goodbye. Sentence8: I would like to take this train. Thank you. Sentence9: Yes if there are any more options, why don't you try and suggest on for me, which ones do you like? Sentence10: I'm happy to help. Where will you be departing from? Sentence11: Yes I would like a reservation for one at 19:30 Sentence12: Okay, I am glad to have assisted you. Goodbye. Sentence13: it should be in the moderate price range. Sentence14: Your booking was successful. The table will be reserved for 15 minutes. Reference number is : 4ZAIQ7NX . Is there anything else I can help you with? Sentence15: There are 69 choices to select from. Can you narrow it down to the type of food and price range? I can then search again for you Sentence16: I am looking for something in the moderate price range in the Centre. Is there anything that meets that criteria? Sentence17: Yes please! I'd like a table for one person at 20:30 on tuesday Sentence18: We do have openings at the oak bistro if you are interested. It is located in centre with moderate price range. Sentence19: How about a table at 19:30? Can you reserve that please? Sentence20: Reference number is : UKTVT9CY . the total fee is 23.6 GBP payable at the station . Sentence21: I apologize but that doesn't seem to be available either. Would you like me to try a different restaurant? Sentence22: What type of food do you like? Sentence23: The only one I find with American food is in the expensive range, it's the gourmet burger kitchen. Is this something you would be interested or would you prefer something else? Sentence24: I am sorry, I am unable to book that right now. Is there anything else I can help you with? Question: Who has spoken the sentence 9? (A) User (B) System
Answer: (B) System