You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: I can book that for you, first I'll need to know where you'd like picked up at. Sentence2: Great! Have a nice day! Sentence3: Excellent, can I get a contact number please? Sentence4: I would like for a taxi to take me to london liverpool street train station, arriving no later than 17:45 please Sentence5: Of course. The contact number is 07689939820. Can I help with anything further? Sentence6: A white Toyota is booked for you. Sentence7: I would like a taxi to take me to London liverpool street train station Sentence8: that's great. thanks Sentence9: I would like to depart from London Kings Cross Train Station. Sentence10: Thank you goodbye Question: Who has spoken the sentence 6? (A) User (B) System
A:
Answer: (A) User