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: Yes, I want to book a table for 3 people at 20:00 on thursday. Sentence2: No, I think that's all I need. Thank you! Sentence3: Thank you for using the Cambridge TownInfo service, and have a wonderful day! Sentence4: I found 21 restaurants available, do you have a type of food you would prefer? Sentence5: I'm looking for a moderately priced resturant in the centre of town. Sentence6: Great, I have booked your table for ali baba thursday at 20:00 for 3. Your reference number is 5LY9WSF1 . May I help with anything else? Sentence7: I would like lebanese food. Sentence8: How does Ali Baba? I recommend it. Would you like for me to book a table? Question: Who has spoken the sentence 5? (A) User (B) System
Answer: (B) System