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

Sentence1: Happy to help! Sentence2: I need a tax going to tang chinese. Sentence3: Nothing else right now. Thanks for the booking. Goodbye. Sentence4: I'll be coming from whale of a time Sentence5: Okay I have a grey lexus and the contact number is 07087526103. Anything else I can help you with? Sentence6: I need to arrive by 05:15. Sentence7: I can help you with that booking, what time are you wanting to leave/arrive by? Sentence8: Sure, where are you coming from? Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System