You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Restaurant Two Two's phone number is 01223351880, the address is 22 Chesterton Road Chesterton, and the postcode is cb43ax. Sentence2: How many people do you need the booking for? Sentence3: I have 7 different options. I have all different price ranges. Do you have a preference? Sentence4: Thank you and enjoy your visit to cambridge. Sentence5: No, I don't need a reservation. I could use the address, postcode and phone number though. Sentence6: Great. Thanks for all your help! Sentence7: Great! I'm also looking for a restaurant in the same area as the hotel that serves expensive french food. Sentence8: What day would you like your reservation to begin, and how long would you like to stay? Sentence9: Yes it does! Free parking too. Sentence10: I would prefer a hotel with a 4 star rating. Sentence11: I have found 11 results for places in the north that have free parking, would you prefer a guesthouse or hotel? Sentence12: There is nothing that fits that criteria, can I look up something else? Sentence13: Actually, I need to know, does the Acorn guesthouse have internet? Sentence14: Just one person please. Sentence15: Need a hostel, free parking and in the north please. Sentence16: Restaurant Two Two is an expensive french restaurant on the north side. Would you like me to make a reservation for you? Sentence17: It can be a guesthouse or a hotel. Does that open up my options? Sentence18: Any one of them would be fine. Can I get the post code and phone number? Sentence19: The acorn guesthouse is at 154 chesterton road postcode cb41da. Their phone is 01223353888. Can I make you a reservation? Sentence20: Yes please make a reservation. Question: Who has spoken the sentence 1? (A) User (B) System
A: 
Answer: (B) System