Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Sure. It's located at 732-734 Newmarket Road. Can I help you with anything else? Sentence2: I'm looking for a hotel called the Leverton house. Can you help me find it? Sentence3: The car will be a yellow toyota and their number is 07865026456, is there anything else you need? Sentence4: Does it have an entrance fee? Sentence5: Okay I also need a taxi that will leave the attraction by 08:45. Sentence6: I am also looking for places to go in town. Maybe something in the south. Sentence7: No, I think that will be all. Thank you for your help! Sentence8: There are several places to go in the south. Are you interested in cinema, entertainment, musuem, a nightclub, or perhaps something else. Sentence9: Thank you very much. Sentence10: That information is not available to me. The phone number is 00872208000. Sentence11: Cineworld Cinema is a great place to visit. It's located on the south side at cambridge leisure park, clifton way. Is there anything else i can help you with? Sentence12: Yes, please give me the reference number. Sentence13: Yes. I would like to book it for four nights, starting Sunday. Five people. Sentence14: Thanks and enjoy your time ! Sentence15: Booking was successful! Your reference number is. PIKSVFZT Sentence16: You're welcome. Have a great day! Sentence17: How about a cinema? Sentence18: Will you be needed a reference number for the booking? Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System