You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: The contact number is 07429438913 and the car type is a yellow Lexus. Sentence2: I have one guesthouse that has free internet and parking on the cheap side. It's also located in the Centre at 56 Saint Barnabas Road. Sentence3: Certainly. I have booked your taxi. Anything else I can help with today? Sentence4: Have a great rest of your day, and I hope your visit to Cambridge is everything you dreamed it would be. Sentence5: I'd like the restaurant to be in the moderate price range. Can you narrow it down? Sentence6: It was unsuccessful. Did you want to try the other one? Or a different time frame? Sentence7: I will, thank you again! Sentence8: I'll take Efes for 3 people on saturday at 15:00 please. Sentence9: Great that's all the info I need, thank you. Sentence10: There are 3 turkish restaurants in that area. How about Anatolia? Sentence11: How about for 3 people on Saturday at 14:00? Sentence12: Your booking was successful at alexander bed and breakfast and your reference number is EGYY9BB7 . Is there anything else I can assist you with? Sentence13: Yes, can you arrange a taxi between the hotel and the restaurant that arrives to the restaurant by 14:00? Sentence14: Thank you for your help! Sentence15: Okay. Glad I could be of help. Please call us again. Sentence16: Yes, I also need a restaurant with Turkish food near the hotel in the centre area please. Sentence17: You're welcome! Please let us know if you need assistance with anything else. Sentence18: I need a place to stay in the centre that has free wifi. Sentence19: There are a bunch of options for you to choose from. Do you have a price range? Sentence20: Please provide me the contact number and car type for the taxi. It will be at the restaurant by 14:00? Sentence21: There is Anatolia and Efes Restaurant available, which would you like to book? Sentence22: I would like it to have a star rating of 4 and cost does not matter, I would also like it to have free parking. Sentence23: The booking was successful for 14:00. Your reference number is 0B58WF1P . Is there anything esle I can do for you? Sentence24: Please book a 4 night stay for 3 people on saturday. Question: Who has spoken the sentence 15? (A) User (B) System
A:
Answer: (B) System