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: byard art is located in the south. The postcode is cb21sj and doesn't charge an entrance fee. Can I help with anything else? Sentence2: I also want to book a taxi to commute between the two places. Sentence3: Either will be fine Sentence4: I have 3 guesthouses and 1 hotel. Do you have a ratings preference? Sentence5: Lets try the south side. Sentence6: I'd like to be picked up at Byart Art museum by 21:00. Could you please book a taxi for me. Sentence7: I'm sorry I do want to stay at a hotel, not a guesthouse. I will just need the price range and post code please. Sentence8: Are you looking for a guesthouse or a hotel? Sentence9: I would like to go to a museum in the south. I need the postcode and entrance fee. Sentence10: Well I have a lot of places matching that description so can we narrow those choices by selecting an area for the hotel to be located in? Sentence11: What is your destination? Sentence12: That's all I need, thanks so much for all of your help! Have a great day! Sentence13: Okay! What kind of place would you like to visit? Sentence14: I want to go to the hotel. Sentence15: Okay, you're all set! You will be picked up in a yellow BMW. The contact number is 07193150653. Can I help you with anything else? Sentence16: the lensfield is nice its expensive and the postcode is cb21en, anything else today? Sentence17: I also need a place to stay at with free wifi and parking. Sentence18: i'm looking for places to go in town Sentence19: Sure, which place do you want to be picked up at and at what time? Sentence20: excellent, have a great day! Question: Who has spoken the sentence 19? (A) User (B) System
Answer: (B) System