You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Thanks! For all your help. Sentence2: I want a cheap price range, please. Sentence3: Is there anything else you need? Sentence4: Good news! Your booking has been successful. Your reference number is 5KCBOHZB . Sentence5: Great, can I have it for 4 people for 2 nights on wednesday and also I need a reference number? Sentence6: I would like it to arrive by 20:30 please. Sentence7: There is the Alexander Bed and Breakfast thich is 4 star and has free parking and wifi. Sentence8: You're welcome, goodbye. Sentence9: I'm also looking for a train to Cambridge that departs from Bishop's Stortford that departs on Wednesday. Sentence10: I have over 10 options. Do you have a preference for a departure or arrival time? Sentence11: Nope, that's it. Thanks! Sentence12: There are 29 choices. Do you have a preference in the area of town and price range? Sentence13: I have booked for you Train Tr9178 the total fee is 40.4 GBP payable at the station. Your Reference number is : IKRVR8G2 . Sentence14: I'll take the train that arrives closest to 20:30 for 4 people please. Sentence15: Hi. I'm looking for a place to spend the night, and I want somewhere without any hidden fees for parking or wifi. Sentence16: There are 8 trains that will arrive by the time you stated. Do you have a preference on what time you leave at? Question: Who has spoken the sentence 10? (A) User (B) System
Answer: (A) User