Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Sorry, there are no polish restaurants in town. Perhaps you'd like to try a different type of food? Sentence2: I was able to book a grey lexus phone number is 07863299997 Sentence3: That's awesome. Thanks. I think that will do it for today. Goodbye. Sentence4: It's an attraction in town. Can you find it by name? I just need their phone number and the cost. Sentence5: Sure, we have la tasca, and la raza. Can I book one for you, if so for how many people and what date? Sentence6: Terrific! I also need a taxi that will get me from Byard to my restaurant by the reservation time, please. Sentence7: Could you find one that serves spanish food, instead? Sentence8: I am looking for a polish restaurant that is in the moderate price range. Sentence9: You have a table and it will be held for 15 minutes. The reference number is 42Z6AY64 . Can I be of further assistance? Sentence10: you are welcome to use our services anytime. Sentence11: I will try la tasca. The booking is just for me on Monday at 15:30. Sentence12: Sure! The cost is free and their phone number is 01223464646. Sentence13: What type of place is that? Sentence14: I also need to find a place called Byard Art. Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System