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: Hi! I'd like to book a taxi from Kettle's Yard to Old Schools. Sentence2: You are welcome. Have a great day. Good bye. Sentence3: Absolutely - do you have a particular arrival or departure time in mind today? Sentence4: Yes, I would like the taxi to arrive by 19:30. In addition, I would like the car type and its contact number. Sentence5: I have completed your booking! The car type is a white volkswagen and the contact number is 07027624842. Sentence6: Thank you so much! That is all I need for now. Question: Who has spoken the sentence 1? (A) User (B) System
A:
Answer: (B) System