You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Perfect, thank you. Sentence2: No problem, let me know if you need anything else. Sentence3: Before I can complete the booking, I need to know what your destination will be? Sentence4: I would like to go to the missing sock. Sentence5: I need a taxi that departs from hobsons house and arrives by 13:45. Sentence6: Ok, I've booked a bluw BMW to pick you up, the contact number for the taxi is 07753554646. Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System