You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Okay great, have a good day! Sentence2: Yes, please. Could I have the reference number as well? Sentence3: Certainly. Can you tell me what day you would like to travel? Sentence4: fitzbillies restaurant serves british food would that be okay? Sentence5: I do not not care, it just needs to be expensive. Sentence6: The one closest to your desired arrive by time will arrive at 12:55 and depart at 11:36. Would you like me to book this for you? Sentence7: Yes, may I have the address? Sentence8: I'm happy to help! There are a great deal of restaurants there. What type of food did you have in mind? Sentence9: I was able to book you 6 tickets for that train. Your reference number is PSQ9JOOI . Is there anything else I can help with? Sentence10: The train should leave on thursday. Sentence11: the train should arrive by 13:45 and book for 6 people and give me the reference number please Sentence12: I'd be happy to, but can you tell me which day you'd like to travel on? Sentence13: Sure, they're located at 51 Trumpington Street City Centre. Can I help you with anything else today? Sentence14: No, I do not think so. Thank you for your help. Sentence15: Yes, can you help me find a train that can take me from Cambridge to Norwich? Sentence16: I'm so hungry - can you find me a place to eat in the city centre? Question: Who has spoken the sentence 2? (A) User (B) System
A: 
Answer: (A) User