Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: It seems there are thirteen trains to Broxbourne arriving by 19:00. What time would you like to leave? Sentence2: Let's book a train, I'll be departing from cambridge and going to broxbourne. Lets look for something on wednesday arriving in broxbourne by 19:00. Sentence3: Thanks! Now I need to find a Lebanese restaurant in the expensive price range. Can you help me find one? Sentence4: We're not picky, please book any train arriving in Broxbourne by 19:00 for 4 people. Sentence5: Is there any in the East? Sentence6: I'm afraid there isn't an expensive Lebanese restaurant in the city. Sentence7: Thanks for all your help. I think I'm good now. Sentence8: There are 4 indian restaurants in the east. Did you have a preference on price? Sentence9: You're welcome, have a great day! Sentence10: I'd like someplace expensive, please. Sentence11: Okay, your booking was successful. Your total fee of 71.59 GBP is payable at the station. The reference number is B5E7R2LE . Sentence12: What about one that serves indian dood? Sentence13: Unfortunately, the only Lebanese restaurant in town is moderately-priced. Would you like to book that restaurant or should I search for a different restaurant? Sentence14: I am planning a trip to Cambridge Sentence15: I am definitely assist with planning that trip. Do you want to start with booking a train, or search a restaurant? Sentence16: I have 2 that are expensive. May I suggest Sitar Tandoori? Would you like to book that? Sentence17: Yes, I need a table for 4 people at 10:15 on Wednesday, if that day is not available then try Friday and provide the reference number. Sentence18: Booking was successful. The table will be reserved for 15 minutes. Reference number is : UYGNM1SV . Question: Who has spoken the sentence 4? (A) User (B) System
A:
Answer: (A) User