You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Booking was successful. Reference number is : 8DW9YAFR . Sentence2: could you please try one night Sentence3: I need a place in the east with free wifi. Sentence4: Great, thanks for your help. Sentence5: Okay that sounds good. Let's book it for just me, and I am planning to stay 4 nights beginning Thursday. Sentence6: Nope that was all I needed today. Thanks! Take care! Sentence7: i am recommending the acorn guest house Sentence8: There are 33 hotels that satisfy your request are you looking for a specific area of town? Sentence9: I apologize, but the hotel isn't available during that time frame. Sentence10: Your welcome, Is there anything else I can help you with? Sentence11: I want to stay at a 4 star hotel Sentence12: You're very welcome. Have a great day! Question: Who has spoken the sentence 9? (A) User (B) System
A:
Answer: (B) System