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

[EX Q]: Sentence1: I meed a moderately priced place to stay. Sentence2: There are 3 guesthouses that meet those requirements I recommend warkworth house. Would you like me to book it for you? Sentence3: I am also looking for a train. Sentence4: I have a train that arrives in cambridge by 18:07. It would be helpful to know your destination so I can serve you better. Sentence5: The train should leave from bishops stortford and go to cambridge and arrive by 19:30. Sentence6: I'll be happy to help you with that. What day would you like to travel and where would you like to depart from? Sentence7: I would like to stay in the east. It should have a 4 stars and I would also like free wifi please. Sentence8: Booking was successful. Reference number is : FGTT1OBZ . Is there anything else I can help you with today? Sentence9: thank you i think you should prepare before departure thank you Sentence10: I have found a list of hotels with a moderate price range, what area, type, star of the hotel would you like? Sentence11: I need to leave from Bishops Stortford the same day I arrive at the hotel. I need to arrive close to 19:30. Sentence12: Yes, please! 5 of us will be staying for 3 nights, and we're arriving on Friday. Question: Who has spoken the sentence 6? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Thank you! That is all I need. Sentence2: You are very welcome! Sentence3: Yes, I'm calling regarding Addenbrookes Hospital. What is the address please? Sentence4: The Addenbrookes Hospital is located at Hills Rd, Cambridge Postcode CB20QQ. Question: Who has spoken the sentence 1? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: thank you. i apreciate having gotten help from your desk. hope to get more and better help sometime latter. looking foward to seeng you latter on, thank you so much again Sentence2: Thank you. Goodbye. Sentence3: And where will you be going to, please. Sentence4: Here you are! Booked car type : yellow lexus Contact number : 07405095877 Sentence5: I would like to go to Prezzo Sentence6: I need to book a taxi to take me from Bangkok City. I need to leave by 19:30. Sentence7: What is the car type? Sentence8: Thank you for allowing me to help. Good bye. Sentence9: Okay I have booked your taxi for you Sentence10: alaways welcome for more services Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]:
Answer: (A) User