You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: I will also need a taxi booked to get me to the restaurant from the hotel please. Sentence2: I also need some help finding a place to eat while there. Can you help me with that? Sentence3: I'm sorry, I am unable to book it for that time either. Is there another time, or day I could try for you? Sentence4: Yes I want to be picked up at the attraction and arrive at the restaurant by my reservation time. Sentence5: Try a different area other than the south. Please make sure it is cheap Spanish food. Sentence6: There are no matches for spanish restaurants in that area another perhaps? Sentence7: I need directions to a good swimming pool in the south of Cambridge, can you give them to me? Sentence8: Happy to help, please let us know if we can be of service in the future. Sentence9: Yes, please book 4 people on tuesday at 14:30 and send me the reference number Sentence10: I booked your table. The reference number is MN2VXHKR Sentence11: Is there another restaurant in that area? Sentence12: Thank you for your help. That is all I need today. Sentence13: Do you mean from the entertainment attraction to the restaurant at 13:30? Or do you need help with a hotel? Sentence14: Unfortunately there are no swimming attractions in the south. Entertainment wise there are 2 options, Nusha and Tenpin. Would you like more info on one of them? Sentence15: I would like a spanish restaurant, preferrably cheap. Sentence16: Is there anything matching that anywhere in the city? Sentence17: Yes please send me the info. Sentence18: Yes I would love that one. Sentence19: Can you try a booking for 13:30? Sentence20: No problem. For Nusha, the phone number is 01223902158 with a post code of cb17dy. For Tenpin, the phone number is 08715501010 with a post code of cb17dy. Sentence21: I really need it to be in the south. If there is no swimming pool in the south, how about an entertainment venue? Sentence22: None,would you like to try a different area ? Sentence23: Yes I can. What type of cuisine are you interested in? Sentence24: I booked you with a white honda taxi service. Their phone number is 07540747460. Sentence25: There is one! La Raza is a cheap Spanish restaurant in city centre. It's a lovely place - would you like to make a reservation? Sentence26: I am sorry, I am unable to book that for you right now. Is there anything else I can help you with? Sentence27: Look in another area. I want a spanish restaurant Sentence28: Abbey pool and astroturf pitch is located in east area. Pool way, white hill road off newmarket road. Would you like any other information? Sentence29: I'm sorry there's nothing that matches that in the south. Do you want me to search in a different area? Sentence30: I found la raza. Shall book it for you ? Question: Who has spoken the sentence 18? (A) User (B) System
A:
Answer: (A) User