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: I do not have an arrival time. Sentence2: It should leave from Cambridge and go to Leicester please. Sentence3: Certainly! What are your departure and destination locations? Sentence4: Your booking was successful, the total fee is 226.8 GBP payable at the station. Your reference number is: 17I15NSK . Is there anything else I can help you with today? Sentence5: Hi, I am looking for a train that leaves on Tuesday after 18:15. Sentence6: Thanks for that information. Is there a time you would like to arrive by? Sentence7: carolina bed and breakfast has free wifi and parking if you want to book there. Sentence8: Yes I also need a guesthouse to stay in. It should have 4 stars, free wifi, in the east location. Sentence9: We have 6 different guesthouses that fit your criteria. Do you have a specific price range in mind? Sentence10: No it doesn't matter. Sentence11: The TR0776 leaves Cambridge at 18:21 and gets into Leicester at 20:06. Do you want me to book it for you? Sentence12: Yes. I would like to book it for 6 people please. Question: Who has spoken the sentence 1? (A) User (B) System
Answer:
Answer: (B) System