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: Sure thing but first can you tell me what kind of food you like? Sentence2: There number is 01223307402 Sentence3: Pizza Express in the centre, would you like me to make you a reservation? Sentence4: Yes, I would like some places to visit while I'm in town. Perhaps something in the same area as the restaurant. Sentence5: Your taxi has been booked. It will be a red Skoda and their contact number is 07842186730. Sentence6: No thank you. I just need the post code for now. Sentence7: How many people in the taxi? Sentence8: cb21db. Is there anything else? Sentence9: Thanks so much! That is all I need. Have a good day! Sentence10: Can you recommend a restaurant in the center of Cambridge that has moderate prices? Sentence11: Can I get their phone number please? Sentence12: May I suggest the Castle Galleries, it's a museum also in the centre area. Admission is free. Sentence13: Thank you have a great day! Sentence14: I would like Italian food. Sentence15: I also need to book a taxi to get from the restaurant to the museum. I plan on leaving the restaurant by 14:00. Sentence16: It is just me by myself Question: Who has spoken the sentence 15? (A) User (B) System
Answer:
Answer: (B) System