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

Sentence1: ask serves italian food and is in the cheap price range. Would you like their location? Sentence2: I am looking for a restaurant in the cheap price range that serves Italian food. Sentence3: Ask is located at 12 Bridge street city centre. Their telephone number is 01223 364917. Sentence4: Have a good day! Goodbye. Sentence5: Thank you, goodbye. Sentence6: Yes please, I would like their address. Sentence7: I don't care which area. Sentence8: There are five restaurants in the cheap price range that serve Italian food. What area are you looking for? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User