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: That is all. Thank you for your help. Sentence2: What about Christ's college? it's free to get in. Sentence3: Okay, your reference number is 1A7ZKZ7F . Is there anything else you need? Sentence4: I am looking for places to go in town. Sentence5: Thank you for contacting Cambridge TownInfo centre. I hope you have a pleasant trip! Goodbye! Sentence6: Yes. I need to book for one. Sentence7: There are 10 trains fitting your criteria. Do you a time preference on arrival or departure? Sentence8: Train ID TR9236 leaves at 13:35 and arrives in Ely at 13:52. Would you be interested in booking that option? Sentence9: There aren't any attractions of that type in the Centre unfortunately, do you have an alternative preference? Sentence10: Sure, it is located on Saint Andrew's Street, postcode cb23bu. Admission is free. Can I be of further help today? Sentence11: Yes, it will need to leave after 12:30. I'll just book it for one person to cambridge. Sentence12: We have many options to choose from, is there a particular type of place you are interested in seeing? Sentence13: Somewhere in the Centre, entertainment. Sentence14: Can you give me the address for Christ's college please? Sentence15: Yes, I need a train coming from Ely on Friday. Sentence16: I could also go to a college instead. Question: Who has spoken the sentence 7? (A) User (B) System
Answer:
Answer: (B) System