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

Sentence1: Yes. I want to book it for 2 nights, 5 people starting on Friday. Sentence2: Sure thing. Do you want me to book it for you? Sentence3: The booking was successful, your reference code is 8090X905 . Do you want further assistance? Sentence4: Can you help me in finding a suitable guesthouse please? Sentence5: I'll take the El Shaddai please. Sentence6: I have two options for you. Both offer free wifi and parking. The El Shaddai has no star rating or the Alexander B & B has a 4-star rating. Sentence7: There are 24 guest houses available. Is there a particular area of the city you'd prefer to stay in? Sentence8: No that's all. Good bye! Sentence9: Yes, I'd like to stay in the centre of town please. Sentence10: Thank you goodbye! Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System