Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: I'm sorry, none of the hotels in the centre are free on those dates. Would you like to try a different number of days? Sentence2: Your booking at the Alexander bed and breakfast was successful, the reference number is L60GOSEU . Sentence3: Just about every lodging in town has internet (it's 2017, after all!). Do you have a certain area or price range in mind? Sentence4: Sure. What time would you like to be picked up from Cambridge Arts Theatre? Sentence5: Thank you Goodbye Sentence6: It needs to be in the same area as theatre and have free parking. I don't care about the price. Sentence7: I don't really care. Can you suggest something? Sentence8: I have booked a black BMW to pick you up. The contact number is 07334398349. Sentence9: That's all for today. Thanks for your help! Sentence10: Can you try for just 2 nights then? Sentence11: I'd actually like to be picked up from Alexander bed and breakfast by 15:30. Sentence12: How about a theatre? Can you give me the post code and phone number for one, please? Sentence13: I will be in Cambridge and am looking for some places to go in the centre while I visit. Sentence14: Can you book it for me? Just for one person starting on Wednesday for 5 nights. Sentence15: Thank you! Can you help me find a hotel to stay in? I need it to have free wifi. Sentence16: The Cambridge Arts Theatre is located at 6 saint edward's passage in postcode cb23pj. Their phone number is 01223503333. Sentence17: Can I please book a taxi to get to the hotel? Sentence18: I'd be happy to help you pick one! There are over 40 attractions in city centre; what type of activity are you interested in? Sentence19: How about a museum? Or we have some terrific colleges you could visit. There's always the theatre as well. Sentence20: Okay its address is located at 6 saint edward's passage and its postal code is cb23pj. Question: Who has spoken the sentence 18? (A) User (B) System
Output:
Answer: (A) User