Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: Thank you. I am all set. Have a great day. Sentence2: Where would you like to go? Sentence3: i want to book a taxi. The taxi should depart from broxbourne train station Sentence4: Have a good stay. Good bye. Sentence5: I have booked you a blue BMW for a 20:15 pickup. The contact number is 07753733237. Can I help you with anything else today? . Sentence6: I need to leave by 20:15 and am headed to city stop restaurant. Question: Who has spoken the sentence 5? (A) User (B) System
Output:
Answer: (B) System