Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: You will arrive by 18:01. Sentence2: No, I need a room for two, for 5 nights starting on tuesday. Sentence3: Yes I can is the room only for you? Sentence4: Travel time on this particular train is 60 minutes. Would you like me to book any seats? Sentence5: I have 19 trains that leave Cambridge for Broxbourne on Tuesday. What time of day do you want to travel? Sentence6: I need to leave after 16:30 please. Sentence7: What is the travel time? Sentence8: TR0189 leaves at 17:01, would you like a booking or just more information for now. Sentence9: I hope so. Can you tell me if there are any 3 star places to stay on the west side? Sentence10: Great. Is there anything else I can help you with today? Sentence11: Okay well I'm glad I could help. Sentence12: Great! Can you book for 3 nights for me please? Sentence13: I have booked it here is the information:Booking was successful. Reference number is : F4WXMKYA . Sentence14: I will to Cambridge from Broxbourne. Sentence15: I see Hobsons House in the west side has a 3 star rating. Sentence16: Where will you be traveling to and from? Sentence17: I also need a train for the same day. Sentence18: No. I don't need to book. I am all set. Sentence19: thanks for the information. that is all i needed Sentence20: How long is the travel time, please? Question: Who has spoken the sentence 6? (A) User (B) System
A:
Answer: (A) User