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: I am sorry, they are unable to accommodate those dates. Can you shorten the stay or try other days? Sentence2: Thank you, I was able to book you for one room on Sunday for 4 people. The Reference number is 08QSW5MB . Is there anything else I can help with? Sentence3: Sure! How about the Cambridge Belfry? It's cheap with four stars. Would that work for you? Sentence4: There are two hotels and two guesthouses on the west side of town. Is there a certain price range you prefer? Sentence5: I am going to Cambridge and I have to leave after 21:15. Sentence6: Where would you like to travel and what time would you like to go? Sentence7: Yes, it does! How many nights would you like? Sentence8: Book the earliest one for 4 people. Sentence9: If you need anything else, let us know. Good bye. Sentence10: A hotel that includes parking. Sentence11: I would like to book it for 4 people and 4 nights starting on Sunday. Sentence12: Okay, booking was successful. The total fee will be 52.8 GBP and your reference number is VFUX9JT1 . Is there anything else I can assist you with? Sentence13: I'd also like to find lodgings on the west side of town. Sentence14: Yes that will be fine as long as it includes free parking. Sentence15: Hi. Are there any trains from Peterborough on Sunday? Sentence16: No, that's all I needed today. Thank you so much. Sentence17: There are a number of trains you can choose, the earliest one being at 21:19 and the latest at 23:48. Sentence18: Can we try booking it for just one night then? Question: Who has spoken the sentence 7? (A) User (B) System
Answer:
Answer: (B) System