You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Ok, I have booked a taxi for you. Its going to be a blue Audi & the contact number is 07493726924. Sentence2: I'd like to book a taxi to take me from the hotel to the restaurant. Sentence3: Hmm, I've never been there. Let's try that. Can you book me a room for Saturday for 5 guests, 2 nights please? Sentence4: Great, you've been awesome. Bye. Sentence5: I would like to stay on the east side, please. Sentence6: Thanks. I need a place to stay also. I would like a guesthouse with free wifi. Can you help me find one? Sentence7: Could I have the postcode, and address of both of them please? Sentence8: Sala Thong is at 35 Newnham Road, Newnham, cb39ey and Bangkok City is at 24 Green Street City, Centre, cb23jx. Sentence9: No problem! Booking was successful. Your Reference number is : MJ95SPPP . Sentence10: Thank you, I would like to commute from the hotel to Sala Thong, and I want to leave by 06:15. Sentence11: I have 2 places, would you like the one in the west or centre of town? Sentence12: There are 6 guest houses in the east that offer free wifi. Can I recommend the Autumn House? Sentence13: Need a place to eat, panasian food, pricey! Sentence14: I'm sorry, there doesn't seem to be any Panasian restaurants that fall into that price range. Would you like to look for a different type of food? Sentence15: I show 23 guesthouses available with free wifi. Which area of town would you like to stay? Sentence16: Have a great day and a great trip! Goodbye. Sentence17: Which restaurant will you be going to and what time would you like to arrive? Sentence18: Thai food would be just as good. Question: Who has spoken the sentence 7? (A) User (B) System
A:
Answer: (B) System