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

Sentence1: That's it. Thank you, goodbye Sentence2: Saigon city serves Asian oriental food, is in the north part of town and in the expensive price range. Sentence3: Hi, I'm looking for a Persian restaurnt in the north part of the city. Sentence4: Unfortunately there are no Persian restaurants in the city. Would you like to try a different cuisine? Sentence5: Thank you for using the Cambridge restaurant system, goodbye. Sentence6: How about asian oriental food? Sentence7: Of course. Their phone number is 01223 356555 and they are located at 169 High Street Chesterton Chesterton. Is there anything else I can help you with? Sentence8: Could you tell me the address and phone number please? Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System