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

Let me give you an example: Sentence1:i need a place to dine in the center thats expensive Sentence2: I have several options for you; do you prefer African, Asian, or British food? Sentence3: Any sort of food would be fine, as long as it is a bit expensive. Could I get the phone number for your recommendation?Question: Who has spoken the sentence 2? (A) User (B) System
The answer to this example can be: Answer: (A) User
Here is why: The sentence 1 is said by a user because the intent of it says that the information has to be gathered from the system

OK. solve this:
Sentence1: Okay, what day and what time would you like to leave? The ride is about 49 minutes and the train comes every two hours. Sentence2: Yes, please. I need 4 tickets. Sentence3: Yes. I need to find a train to travel from Stevenage to Cambridge. Sentence4: Actually, can I get the address and phone number please? Sentence5: Great! That was successful and your booking reference number is NXSAEV12 . Sentence6: No, just pick something. Sentence7: That should do it. thank you! Sentence8: The Cambridge Contemporary Art Museum is a good attraction that is free. Would you like the address or directions? Sentence9: What good attractions are there in the city centre? Sentence10: I need to leave Saturday and must arrive by 20:00. I don't care what time the train leaves as long as I arrive on time. Sentence11: Sure, it is located at 6 Trinity Street. The phone number is 01223324222. Can I help you further? Sentence12: Ok great! I hope that you enjoy your travels! Thank you for contacting the Cambridge TownInfo centre. Sentence13: I have train TR2442 leaving stevenage at 17:54 and arriving in cambridge at 18:43. Would you like to book this? Sentence14: There are over 40 of them, many of which are free; did you have anything more specific in mind? Question: Who has spoken the sentence 6? (A) User (B) System
Answer:
Answer: (A) User