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

Sentence1: Okay, I've got you book in a black lexus with Contact number 07490949646. Sentence2: the lensfield hotel is a 3 star hotel in the south and gonville hotel is a 3 star hotel in the centre Sentence3: We have a few choices to pick from, any preferences on pricing or area? Sentence4: The phone number is 01223366611. It is expensive. Sentence5: Thank you so much. That's all I need for today. Good-bye. Sentence6: I would like a hotel while in cambridge. It doesn't need parking or internet. Sentence7: The entrance fee is not available. Is there anything else I can help you with today? Sentence8: Thanks! I also want to ride on a boat, is that something you can help with? I would like to do this in the south area of town. Sentence9: What is the price range and phone number of the gonville hotel? Sentence10: The price doesn't matter are there any 3 star places available? Sentence11: Yes, I also need a taxi. I need to leave the hotel by 07:30. Sentence12: Hmmm...how about a nightclub, instead? Sentence13: Was there an entrance fee to that nightclub? Sentence14: Ok. I hope you enjoy your trip. Sentence15: No boats in that area, is there another location you have in mind? Sentence16: There is the place their address is 22 sidney street and number is 01223324600. Is there anything else I can help you with? Question: Who has spoken the sentence 13? (A) User (B) System
Answer: (B) System