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: The Michael House cafe is an expensive european restaurant located in the centre. Would you like me to make you a reservation? Sentence2: You're welcome. Enjoy your day. Sentence3: That will be all. Thank you very much. Sentence4: Yes, please. For a party of 7 on Friday, at 17:15. Sentence5: Yes I am looking for information on Michael House cafe. Sentence6: Booking was successful. The table will be reserved for 15 minutes. Reference number is : ALCPCA3P . Is there anything else I can help you with? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User