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

Sentence1: We have 4 available for you. The ADC Theatre is nice. Would you like more information about it or the others? Sentence2: Absolutely, I would love to help you with that! Do you have a specific area of town or a specific price point that you would like? Sentence3: The Avalon Guesthouse is in a very safe neighborhood in the north. Would you like me to book that for you? Sentence4: I have not decided yet. Sentence5: You and your party are booked at the Avalon. Your reference number A7T5CV0X . Can I help with anything else Sentence6: ADC Theater is located on Park Street in postcode cb58as. Is there anything else you need? Sentence7: Well that's ok we can book it later if you want. Is there anything else I can help you with? Sentence8: I am also looking for a nice theatre to visit in the centre of town. Sentence9: Yeah, could I get its address? Sentence10: No that was it. Thank you so much for your help. Sentence11: Of course I'd be happy to. How many people, when, and for how many days? Sentence12: Actually, I do believe I would like to book the Avalon Guesthouse. Can you help me with this? Sentence13: You're welcome. Enjoy your stay and visit to the theatre. Sentence14: Hi. Could you help me find a hotel for my trip? Sentence15: I would like a 4-star hotel in the north area. Oh, and no free parking. I'm concerned about safety when people park their cars next to the hotel! Sentence16: for 6 people for 5 nights starting on Monday Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System