Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Booking completed! Booked car type is grey volkswagen and their contact number is 07125735231 Sentence2: thank you Sentence3: Yes, I'd like to book a taxi from clare college. Sentence4: Where is the destination? Sentence5: I'm going to sheep's green and lammas land park fen causeway. Sentence6: It should arrive by 04:00 please. Sentence7: When do you need to leave from Clare College? Sentence8: you are welcome, goodbye. Question: Who has spoken the sentence 4? (A) User (B) System
A:
Answer: (A) User