You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: I need a place in the north with free wifi, please. Sentence2: Thank you for using our service! Please contact us if you need more information about Cambridge. Have a good day. Sentence3: Your booking was successful. The table will be reserved for 15 minutes. Reference number is DPR6YMGB . What else can I help with today? Sentence4: You have eight options for lodging. Do you need parking? Sentence5: Yes, Can you please book a table at the grafton hotel restaurant for the same amount of people at 11:15 on the same day? Sentence6: That sounds great please book it for 1 person for 4 nights starting on sunday. Sentence7: No that does not matter. Please make a suggestion and book it for 1 people and 4 nights starting from sunday. Sentence8: Your booking for 1 at the arbury lodge guesthouse this sunday for 5 days 4 nights was successful. Your Reference number is : X1GCL10K . Anything else for today? Sentence9: I can help with that. What is your price range? Sentence10: I don't care about the price, but it should be 4 stars. Sentence11: That will be all. Thank you! Sentence12: how about arbury lodge guesthouse? Question: Who has spoken the sentence 4? (A) User (B) System
A: 
Answer: (A) User