Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: Yes, I am looking for free parking. Internet is not important. Sentence2: There are 11 guesthouses in the north, do you need free parking or free internet? Sentence3: Is there a price range you'd like to stay in? Sentence4: Okay book it for 2 people for 3 nights and let me have the reference number. Also find me a Train departing from London liverpool street to arrive Cambridge by 08:15. Sentence5: Not particularly considered about price range, just as long as it's a 4 star hotel Sentence6: London liverpool street to arrive Cambridge by 08:15 the TR536 leaves at 8:00,Would you like me to book it for you ? Sentence7: Hello, I'm looking for a gueshouse on the northside. Sentence8: I recommend the Acorn Guest House. Would you like me to book a room for you? Question: Who has spoken the sentence 3? (A) User (B) System

Answer: (B) System