You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

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
Solution: Answer: (A) User
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

New input: Sentence1: That should work as well! Please go ahead and book! Sentence2: The phone number is 01223337766. Can I help you with anything else? Sentence3: There is a train (TR7062) that leaves at 16:40, will that work? Sentence4: May I ask how many tickets you would like for that train? Sentence5: On second thought, I will go ahead and book later. We may need more tickets for some guests we might have coming. Thanks so much. Goodbye. Sentence6: Unfortunately, I haven't found any inexpensive restaurants that serve Scandinavian food. Would you be willing to look for a moderately priced restaurant instead? Sentence7: Actually that one is sold out however TR2001 leaves at 16:40 as well. Travel time is 28 min and price is 8.08 pounds. Sentence8: Thank you for using Cambridge TownInfo centre. Please remember us for all of your future travel needs. Sentence9: There are many trains that are available, could you give me some more information on what you're looking for? Sentence10: Yes I need to go to stansted airport from cambridge on saturday after 15:45. What are my options for this? Sentence11: I have found four different British restaurants in the Centre area with a moderate price range. May I recommend Restaurant One Seven? Sentence12: Yes, that sounds perfect. Can you tell me the price and travel time, or duration, on that one? Sentence13: Is there an inexpensive restaurant which serves Scandinavian food? Sentence14: Unfortunately there are no Scandinavian restaurants in that area. Would you like to try another type of cuisine? Sentence15: I also want to know about taking the train down there. Sentence16: How about british food? Sentence17: yes, that is fine. Please make sure it's in the centre of town. Sentence18: Yes, that sounds good, can I get their phone number? Question: Who has spoken the sentence 12? (A) User (B) System
Solution:
Answer: (A) User