You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Example input: 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
Example output: Answer: (A) User
Example explanation: The sentence 1 is said by a user because the intent of it says that the information has to be gathered from the system
Q: Sentence1: I believe that will be the case. Anything else I can help you with? Sentence2: It looks like that day and time are full. Is there another day or time slot you would like to try? Sentence3: Just the postcode for the Cambridge and Country Folk Museum, please. Sentence4: Yeah, I need a place to go. I want to go to the museum and it should be in the west area. Sentence5: I was able to book the table for your party of eight at 16:00. The reference number is RLTOT7X2 . Can I help you with anything else? Sentence6: I have successfully booked your taxi. You will be riding in a blue BMW. The company's contact phone number is 07883192583. Would there be anything else I could help with? Sentence7: Yes, please. I need a table for 8 on Thursday at 17:00. Sentence8: The postcode is at cb30aq Sentence9: Is there a specific time you would like the taxi to arrive at the restaurant or museum? Sentence10: You're welcome! Have a nice day. Goodbye. Sentence11: No that will be all I need, thanks. Sentence12: Thank you. I also need a taxi to get between the restaurant and the museum. Sentence13: There is a Museum of classical archaeology on sidgwick avenue for free, and a Cambridge and Country Folk Museum located at 2-3 castle street for 3.50 pounds.There are also several free galleries in the area. Can I give you more information on any of these? Sentence14: Where can I find a Vietnamese restaurant in West Cambridge? Sentence15: I want to make sure that it will arrive by 16:00. Can you please confirm? Sentence16: How about a table for 8 on Thurday at 16:00 Sentence17: There is one vietnamese restuarant in the west area, thanh binh. Can I book a table for you, if so how many will be dining? Sentence18: By 16:00 and I need the contact number and car type please. Question: Who has spoken the sentence 4? (A) User (B) System
A:
Answer: (A) User