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: Great! Have a lovely trip! Goodbye! Sentence2: I don't really have a preference. Anything is fine. Sentence3: I was unable to book that for you. Would you like to change the length of your stay? Sentence4: You might enjoy the Broughton House Gallery located at 98 King Street. Is there any other information you need? Sentence5: It seems there are not any locations that fit that criteria. Is there anything you could change regarding your preferences? Sentence6: The acorn guest house meets all of your preferences. Would you like me to book a room? Sentence7: I have 11 museums in the centre of town available, do you have a preference? Sentence8: Yes, I was able to book for 2 nights. Your reference number is QD303GCI . Sentence9: It is free to visit. Is there anything else i can do for you? Sentence10: No anywhere would be fine but I would like a guesthouse with free wifi. Sentence11: Could you see if they have 2 nights starting on tuesday? Sentence12: Could you tell me how many people will be staying? Sentence13: Yes, I am looking for an expensive hotel to stay that includes free parking. Sentence14: I have many that meet your demands. Do you have a part of town you prefer to stay in? Sentence15: How about a moderately priced guesthouse instead of expensive? Sentence16: Yes, please. I'll need the room for three nights starting on Tuesday. Sentence17: No that was it! Thank you so much. Sentence18: I'm also looking for a museum in the centre of town. Sentence19: Thanks. I just need the entrance fee for that gallery please. Sentence20: Just one person please. Question: Who has spoken the sentence 8? (A) User (B) System
Answer:
Answer: (A) User