You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: I can certainly help you with that. The Express by Holiday Inn is a great choice. So can you confirm that was Friday for 2 people, 2 nights? Sentence2: Actually, I change my mind. I can arrange the booking myself. Can you just let me know if they offer free wifi? Sentence3: Can you book me a room for 2 people for 2 days starting Friday at the express by holiday Inn in cambridge. Sentence4: Yes, they do have internet. Sentence5: You're welcome. Please contact us if you would like us to make the reservation instead. Sentence6: Thank you for all your help today. Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User