Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Would you like to book a room at the acorn guest house? It is in the moderate price range like the Hamilton Lodge. Sentence2: Nope. I think that is all I need. Thanks for your help! Sentence3: Yes that will be fine. Sentence4: Your booking was successful. Your reference number is 1WRSIG9U . Is there anything else I can help you with? Sentence5: Happy to help. Have a great day! Good-Bye! Sentence6: I am sorry the booking was unsuccessful,can I help you find another place in the same area? Sentence7: Yes please. I'd like a room for 5 people on Monday for 5 nights. Sentence8: Yes, this guesthouse is open. Do you need help with booking? Sentence9: How about another hotel in the same price range? Sentence10: Howdy! Is the Hamilton Lodge still open? Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System