You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: No, I'm all set. Thanks! Sentence2: We have several attractions in the South. Which would you be most interested in; cinema, entertainment, museum, night club, park or theatre? Sentence3: Was that train on Saturday? I don't remember telling you the day. Sentence4: I booked you with TR7015 your reference number is K1AY8EKU . Sentence5: Just pick one for me and send me their poscode, phone number and address. Sentence6: I'm going to Cambridge, leaving after 13:00. I'll need to book for 7 people. Can I get a reference number too please? Sentence7: Yes please can you help? Sentence8: i am glad i can help enjoy your stay ! Sentence9: Nusha is located at Unit G6, Cambridge Leisure Park, Clifton Road. Their post code is cb17dy, and their phone number is 01223902158. Sentence10: I'd love to help! Where is the destination? Sentence11: Sorry, I can fix that. Did you need it for Saturday? Sentence12: Yes, I was able to fix that. I have a booking for seven people to leave Broxbourne on Saturday at 13:32. Total fee is 100.24 GBP, payable at the station. Reference number is WZZMBZQ4 . Is there anything else? Sentence13: I also need a train from broxbourne. Sentence14: great! i have two options for you to choose from! Sentence15: I am looking for an entertainment type attraction. Sentence16: I am looking for something entertaining in the south. Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System