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

Sentence1: You're very welcome! Have a great time in town! Sentence2: No that's it! Thank you! Sentence3: You are booked with a grey volvo, phone number is 07406139758. Anything else I can do for you? Sentence4: I need a taxi from Kings Lynn station at 5:15, going to HK Fusion, please. Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System