Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: Yes please book tickets on that train for 7 people and send me the reference number Sentence2: Thank you so much. And yes, I also need to find a train to Bishops Stortford, please. I will be leaving from Cambridge on Tuesday. Sentence3: Your booking was successful, your reference number is WT2VB50O . Sentence4: There are 10 trains to choose from. Do you have a preferred time to leave after or arrive by? Sentence5: You're welcome and enjoy your trip. Sentence6: I want it to arrive by 16:00. Sentence7: De Luca is a moderately-priced Modern European place at 83 Regent Street in the center of town. Would you like to book a table there? Sentence8: Hello, what can you tell me about de luca cucina and bar? Sentence9: Yes, I need it booked for 7 people on Tuesday at 19:30. Sentence10: You are all set! Your table will be reserved for 15 minutes. Your reference number is 5R3GSQVS . Do you need anything else? Sentence11: There are 5 trains matching your query. The latest arrives by 14:07. Do you want to book it? Sentence12: Thank you thats all I need for now. Question: Who has spoken the sentence 5? (A) User (B) System
Output:
Answer: (B) System