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: Thank you. I also need a train on wednesday arriving by 17:00. Sentence2: No, I just need to arrive by 17:00. On Wednesday. Please book the train closest to that arrival for 4 people and give me a reference number Sentence3: I would like to depart from Kings Lynn. Sentence4: Booking was successful.Reference number is : OEBH1Q9H . Sentence5: Yes please book it for 4 people and 5 nights starting from Wednesday. Sentence6: Is there a time in your mind for leaving? Sentence7: The Train ID is TR5153. It leaves at 16:11 and arrives at 16:58. Your reference number is 1T9WEZTE . Can I help with anything else? Sentence8: Awesome, thank you so much for your help! That will be all, goodbye. Sentence9: Okay! Alexander Bed and Breakfast is a cheap, 4-star guesthouse in the Centre of town, at 56 Saint Barnabas Road, with internet and parking. Shall I book a room? Sentence10: Where would you like to depart from? Sentence11: I'm looking for information on a hotel called alexander bed and breakfast. Sentence12: Thank you and enjoy your time in our beautiful city! Question: Who has spoken the sentence 9? (A) User (B) System
Output:
Answer: (B) System