Teacher: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Teacher: Now, understand the problem? If you are still confused, see the following 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
Solution: Answer: (A) User
Reason: The sentence 1 is said by a user because the intent of it says that the information has to be gathered from the system

Now, solve this instance: Sentence1: I also need to know what the price range is for this restaurant. Sentence2: Not a problem! Have a great day now! Sentence3: Great! One of these trains should work, thank you and goodbye Sentence4: No. Just choose one and give me the phone number and address please. Sentence5: Um, one of what trains should work? Hello? Sentence6: No, instead I'd like to find a gastropub restaurant in the centre. Can you help me with that? Sentence7: Yes definitely. I have 3 to choose from. Some are expensive and one is in the moderate price range. Do you have preference/ Sentence8: I would like to depart stansted airport saturday and arrive in Cambridge by 12:00. Could you also let me know the cost? Sentence9: This restaurant is expensive. Can I help you with anything else? Sentence10: That will be all. Thank you for your help. Sentence11: I'm very sorry for the confusion, there are 19 trains travelling to cambridge on saturday, do you need to depart or arrive at any particular time? Sentence12: Hello, I'm traveling to Cambridge from Stansted Airport on Saturday and need to find a train. Sentence13: All trips arriving by 12:00 cost 8.08 pounds. Is there a specific time you would like to depart? Sentence14: No problem. The Backstreet Bistro is at 2 Sturton Street City Centre. They're phone number is 01223306306. Is there anything else I can help you with today? Question: Who has spoken the sentence 5? (A) User (B) System
Student:
Answer: (B) System