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 was able to book you. Your reference number is E7AJ44N7 . Sentence2: I also need to find a guesthouse to stay in that is 4 stars. Sentence3: No, that will be all. Thanks. You've been a great help. Goodbye. Sentence4: Okay, I've booked your room for 8 people starting on Monday at the A&B Guest House. Your reference number is C6M738RF . Anything else for you today? Sentence5: Ok great, I need a room booked for 8 and for 5 nights starting on the Monday. Sentence6: Yes there is internet. Sentence7: You can just pick one for me. I'd like a 4 star guesthouse with free wifi. I need a room Monday for 5 nights and 8 people. Sentence8: I'd be happy to help with your request, which place did you want to book a room at? There are 18 results and all have free wifi. Sentence9: Do any of them have free wifi? Sentence10: TR1997 leaves Cambridge at 09:01 on Saturday and arrives in broxbourne at 10:01. Will that work for you? Sentence11: Great can you get me 8 tickets please? Sentence12: we have quite a few when were you planning your stay? Sentence13: Thank you for using the Cambridge TownInfo centre. Goodbye Sentence14: I am looking for information in Cambridge Sentence15: Okay, and what kind of information can I retrieve for you today? Sentence16: I need to know if any trains are running to Broxbourne on Saturday that arrive by 10:30. Question: Who has spoken the sentence 11? (A) User (B) System
Answer:
Answer: (B) System