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: I need a reservation for 5 people and 5 nights starting Wednesday. Thanks! Sentence2: No thanks, that's all I needed. I appreciate your help! Sentence3: I'm happy we could be of service. Enjoy your stay in Cambridge! Sentence4: An inexpensive area with free parking if possible. Sentence5: I just need to know for what day, how many nights and how many guests for the reservation. Sentence6: Sure! I would like that! Sentence7: Okay, I recommend the Acorn Guest House. It's located in the north. Would you like me to book a reservation for you? Sentence8: Sure. Would you like a particular area of town? Sentence9: Done! Your reference number is PMWGUS04 . Can I help you with anything else? Sentence10: i want a place to stay in Cambridge the is moderate price no wifi Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System