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 suggest nusha, unit g6, cambridge leisure park, clifton road. Phone 01223902158, postcode cb17dy. I'm not sure if there is an entrance fee another one is tenpin phone 08715501010. Sentence2: should be in the type of architecture in the South part of town Sentence3: Sorry, we don't have any architecture attractions in southern Cambridge. Can I help you with something different? Sentence4: I am looking for interesting places to go in the south part of town. Can you help me with that? Sentence5: I absolutely can! What type of entertainment are you looking for. There are museums, cinemas, nightclubs, entertainment events, theatres, and parks. Sentence6: How about something with entertainment? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User