Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: You're all set, your reference number for the booking is UFVH6K6Y . Sentence2: What is your day of travel and your preferred arrival time? Sentence3: The guesthouse will be ok, as long as it's rating is a star of 4. Sentence4: No, I need a hotel, not a guesthouse. Sentence5: The only hotel in the area is a guesthouse called, a and b guest house. They are 4 stars. Sentence6: Yes, indeed, the A and B guesthouse does have a 4 star rating. Would you like a booking? Sentence7: That would be great. I am also looking for a hotel. I would like to stay in the east side of town, and I do not need parking. Sentence8: You're welcome. Have a great day too! Sentence9: I'm leaving from Stevenage and I'll need to leave sometime after 21:15 if possible. Sentence10: Train TR3190 will depart at 21:54, would you like me to book that for you? Sentence11: I need a train to cambridge Sentence12: Thanks, that's all I need. Have a nice day. Sentence13: I am sorry but there are no hotels in that area. a and b guest house has 4 stars. Would you like to give it a try? Sentence14: Can I book 4 nights for 6 people on that same Wednesday? Sentence15: I'm working at leave on Wednesday after 21:15 Sentence16: Where will you be leaving from? Question: Who has spoken the sentence 9? (A) User (B) System
Output:
Answer: (B) System