You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: There is a lot to do in the centre. Is there a certain type of attraction you'd like to see or do? Sentence2: Hope you have a great time during your trip. Sentence3: Ok. I also need info on the restaurant Darrys cookhouse and wine shop. Sentence4: That was so nice of you to say thanks so much. Sentence5: Darrys Cookhouse and Wine Shop is a modern European restaurant located in the centre of town. It's in the expensive price range. Would you like to make a reservation? Sentence6: Hello, I am looking for some places to go in the centre of town. Sentence7: I don't think so. Thanks for all your help. Sentence8: We don't have any multiple sports facilities in the centre of town. Do you want to look for something else? Sentence9: Booking was successful. The table will be reserved for 15 minutes. Reference number is : BT75ESXM . Can I help you with anything else? Sentence10: You're very welcome! Take care! Sentence11: Yes, that would be great. I'll need a table for 7 on Friday at 18:00. Sentence12: That would be great. Can I have the postcode, address, and entrance fee please? Sentence13: How about a theatre? I think we would enjoy seeing a show! Sentence14: May I recommend Cambridge Arts Theatre located in the centre of town? Sentence15: I don't have any information about admission, but you can call them to get more information. The number is 01223503333. The address is 6 saint edward's passage cb23pj Sentence16: I was thinking something related to multiple sports Question: Who has spoken the sentence 4? (A) User (B) System
A:
Answer: (A) User