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: Sure, it is a 4 star guesthouse located at 154 Chesterton Road. The postcode is cb41da and you can call them at 01223353888. Is there anything else you need? Sentence2: What are the prices like there? Sentence3: Thank you for contacting Cambridge TownInfo centre. Goodbye! Sentence4: Thank you, I am also looking for a hotel on the north side. Sentence5: Yes, a taxi, I want to leave the attraction and go to the hotel by 22:00 Sentence6: Any area is fine. Do you have a favorite? Maybe we can check that one out. Which one do you like? Sentence7: Acorn Guest House is a moderately priced hotel. They provide internet and parking. Would you like to book something? Sentence8: Broughton house gallery was great the last time I was there and I think you'll enjoy it as well. It even has no entrance fee. Sentence9: I like a guesthouse in the moderate price range. Sentence10: thats all I needed, thanks Sentence11: I am showing a listing of 23 different museums in various areas of cambridge. Do you have a specific area you would like to visit? Sentence12: There are 5 hotels on the North side. Are there any specific accommodations you were looking for? Sentence13: Could you give me the postcode, phone number and star rating of the guesthouse? Sentence14: acorn guest house would be nice for you Sentence15: You're booked in a black Audi, contact number 07701261182. Can I help you with anything else today? Sentence16: Awesome, can I get the phone number, postcode and area for that? Sentence17: The Broughton House Gallery is in Centre. The phone number is 01223314960, and the postcode is CB11LN. Sentence18: Hello, I'm looking for an museum. Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System