You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Yes. Something in the same area and same pricerange, please. Sentence2: I am so sorry, but I was not able to book this. Would you like to try a different restaurant? Sentence3: I can book reservations for a thai in the centre area that meets your needs Sentence4: You're very welcome. Goodbye. Sentence5: Can you help me find a restaurant by the name of Bangkok City? Sentence6: There are 6 of us. Sentence7: Yes please that would be great. We love thai. Sentence8: No thank you. I would like to book a reservation for Wednesday at 5:45 pm. Sentence9: Great news. I was able to book the Sala Thong and your reference number is VMHJ6Y3I. Sentence10: Unfortunately, the restaurant is booked. Would you like to try another restaurant? Sentence11: Yes please try to book a different Thai restaurant. Sentence12: Thanks so much. That is awesome! Have a good day! Sentence13: and how many people will the reservation be for? Sentence14: Certainly, bangkok city is a thai restaurant in the centre area in the expensive price range. Would you like their address? Question: Who has spoken the sentence 10? (A) User (B) System
Output:
Answer: (A) User