Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Is there ones that are on the more expensive price range? Sentence2: At the moderate price range, how about the Bridge Guest House? Sentence3: You might want to try alexander bed and breakfast. Sentence4: That'll be fine. I would like to book 2 people for 2 nights starting on tuesday. Sentence5: I would like free wifi and it needs to have at least 3 stars. Sentence6: No thats all, thank you very much! Sentence7: I'm sorry booking was unsuccessful. Would you like to try for a shorter stay? Sentence8: I was able to get the Bridge Guest House for 2 people for Tuesday night. Can I help you with anything else? Sentence9: Yes, I'll need the reference number for that booking. Sentence10: I'm curious about places to get a room for the night that are on the cheap end of the spectrum. Sentence11: The Reference number is : 3YXIHQLI . Can I assist you any further? Sentence12: I can't find anything that fits my criteria Sentence13: Thanks for using our services. Sentence14: Sure, can you book it for 1 night? Question: Who has spoken the sentence 9? (A) User (B) System
A:
Answer: (B) System