Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: TR5331 leaves Kings Lynn at 15:11 on Friday and arrives in Cambridge at 15:58. Will this train work for you? Sentence2: Yes, I need a train departing from kings lynn. Sentence3: There are several listings. Do you have a food preference? Sentence4: Okay, have a wonderful visit in cambridge! Sentence5: I'm leaving from kings lynn on sunday after 14:30 and arrive at cambridge. Sentence6: No. The train should leave on Sunday as I said. Sentence7: What time will you be departing and where will you be departing from? Sentence8: I have booked your seats,here is the information:Booking was successful, the total fee is 54.88 GBP payable at the station . Reference number is : 5C3SFLV2 . Sentence9: Booking was successful. The table will be reserved for 15 minutes. Reference number is : 9ATX95AG . Sentence10: No. Could you pick something you like for me? Sentence11: Yes please. I need 7 seats. Sentence12: I also need a cheap place to eat in the center of town. Sentence13: That is perfect. That is all I need today. Sentence14: Can you get me a table for 7? My group will probably head there at 17:00 on the same day. Sentence15: I would recommend the river bar steakhouse and grill, a modern european joint at Quayside Off Bridge Street. Would you like to make a reservation? Sentence16: I have the TR2965 leaving kings lynn sunday at 15:11. Would you like me to book that for you? Question: Who has spoken the sentence 9? (A) User (B) System
Output:
Answer: (B) System