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

Sentence1: I am looking for a particular hotel. Its name is called city centre north b and b Sentence2: Booking was successful. Reference number is : KA34QUWB . Sentence3: Yes please. I need reservations for eight people starting this Wednesday and we need it for three nights. Sentence4: Thank you goodbye Sentence5: That's all I need, thank you! Sentence6: City centre north b and b is a guesthouse in the north and is in the cheap price range. Would you like me to make you a reservation? Sentence7: Could you start the booking on Saturday? Sentence8: I'm sorry. The booking was unsuccessful. Do you want to change the number of nights or the starting day? Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System