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

Sentence1: Any is fine, I'm not picky Sentence2: Saint johns chop house is located on 21 - 24 Northampton Street. Would you like to book a table? Sentence3: How about a museum? And could you provide me with a postcode and phone number please? Sentence4: You're welcome, enjoy your stay! Sentence5: Booking was successful. The table will be reserved for 15 minutes. Reference number is : 5CWN8I1X . Sentence6: Thank you so much. That is all I need. Sentence7: Yes. Would you be able to book Monday at 18:15 for a party of 3? Sentence8: I am looking for a restaurant called Saint Johns Chop House, can you help me find it? Sentence9: Do you have a preference on whether it is a college, museum, or entertainment? Sentence10: I'm also looking for places to go while I'm there, preferable something in the west. Sentence11: Kettle's Yard is great. Their phone number is 01223748100. The postcode is cb30aq. Sentence12: There are 13 entries that match your criteria. What entrance fee are you looking to meet? Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System