You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Alright. I'll first need to know a time for the booking as well as a pickup location please Sentence2: Thanks much, goodbye! Sentence3: The taxi should arrive by 05:30. Sentence4: Thank you. Please let us know if you need any further help. Sentence5: I need a taxi to go to the hotpot. Sentence6: All right, your car is booked. It's a grey ford with a contact number of chips342234yy1. Sentence7: I'll need your pickup location to book the taxi. Sentence8: I'll be leaving from the cambridge chop house. Question: Who has spoken the sentence 5? (A) User (B) System
A: 
Answer: (B) System