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

Sentence1: We have Cityroomz in the area. Would you like me to book you a room? Sentence2: Hello, I am going to nee a place to go in the centre of town. Multiple sports would be best. Sentence3: You can find Broughton House Gallery at 98 king street. The postcode is cb11ln, and entry is free. Sentence4: Starting on Wednesday please. 2 nights for 2 people. Sentence5: Yeah, that would be great. Thanks. Sentence6: Can I have the postcode, entrance fee and address? I also need a hotel within a moderate price range. Sentence7: Unfortunately, we don't have any attractions that match that description. Could you like to explore other areas? Sentence8: That would be the Broughton House Gallery. Do you need anything else? Sentence9: Are there any moderately priced hotels in that same area? Sentence10: No. Could we try a museum in the centre of town? Sentence11: That is everything I needed for today. Thank you for your help! Sentence12: OK, what nights and how many people? Sentence13: OK, you're all set for 2 nights at Cityroomz. Your reference number is NWD2GD50 . Can I help with anything else today? Sentence14: The are 11 entries found for "museum" at the center of town. Would you like the first listing? Sentence15: Thank you for using this system. Sentence16: Yes please. I need a room for 2 people for 2 nights starting wednesday. Question: Who has spoken the sentence 13? (A) User (B) System
Answer: (B) System