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: There is a Train, TR572 that departs from london kings cross Monday at 11:17 Sentence2: There are 973 trains that meet your needs. What is your departure station and what day are you traveling? Sentence3: La Mimosa is an expensive Mediterranean place in the centre. Would you like me to book this for you? Sentence4: Ok, great thanks. Could you also give me information on a restaurant called la mimosa? Sentence5: I will be departing from London Kings Cross and want to leave on Monday. Sentence6: Thank you, that is all I need at this time. Sentence7: What time would you like the reservation? Sentence8: I would like the reservation for 20:00. Sentence9: La Mimosa restaurant for 7 people at 15:15 on Monday. Can you please send me the reference number? Sentence10: I am looking for information on train schedules. i need a train that leaves after 11:00 to Cambridge. Sentence11: Yes please book it for seven people on the same day also please give me a reference number Sentence12: I'm sorry, but can you please restate your requirements for the restaurant. There seems to be an error. Sentence13: No, sorry. The train id is TR5720. That is the london kings cross to cambridge on monday at 11:17. Sentence14: Okay! Great! I was able to book that restaurant at 15:15 for 7 people on Monday and your reference number is C0BM6NFL . Sentence15: Perfect. I'd like to be on that train. TR572, is that the train ID? Sentence16: You are welcome, goodbye! Question: Who has spoken the sentence 15? (A) User (B) System
Answer:
Answer: (B) System