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: Okay, where will you be departing from and what is your destination please Sentence2: Thanks that's all I need for the night. Sentence3: Your restaurant booking was successful. The table will be reserved for 15 minutes. Reference number is : IH9ELVHA . Is there something more I can help with? Sentence4: Thank you very much and have a wonderful evening. Sentence5: Booking was successful, the total fee is 53.7 GBP payable at the station, Reference number is : GZWMON81 . Any further questions today? Sentence6: sure, i have their information. what would you like to know? Sentence7: I need the train for 3 people. Sentence8: Tr5570 will be perfect. Shall I book it? Sentence9: How many people need train tickets? Sentence10: I also need a train Sentence11: Yes, please and can you provide me a reference number? Sentence12: Hi, I am looking for a restaurant called nandos city centre. Sentence13: I'll be leaving broxbourne and traveling to cambridge on friday. I must arrive by 10:30 Sentence14: Please do assist to book a table for 3 people for me for Friday dining by 13:45 and also let me have their address and phone number. Question: Who has spoken the sentence 11? (A) User (B) System
Solution:
Answer: (B) System