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

Sentence1: I can help you with that. When do you need to leave? Sentence2: I will be departing from meze bar restaurant. Sentence3: Where are you departing from? Sentence4: I want to take a taxi to eraina Sentence5: Thank you for your help! Sentence6: Have a good trip! Sentence7: I would prefer to leave after 06:45 Sentence8: You are welcome. May I help you with any other bookings? Sentence9: No, that's all thank you Sentence10: Booking completed! Booked car type : grey volvo Contact number : 07740734110 Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System