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: thanks,i really appreciate your help today Sentence2: want to book a taxi Sentence3: I am departing from sala thong and need to go to abbey pool and astroturf pitch. I need to arrive by 16:45. Sentence4: Booked! Your car is a yellow toyota. Contact number: 07041103823. Sentence5: Where are you going & where should it pick you up? Sentence6: No problem. If you need anything else, don't hesitate to call back. Goodbye. Question: Who has spoken the sentence 4? (A) User (B) System
A:
Answer: (A) User