Teacher:In this task, you're given a dialogue between a customer and a flight booking agent with a gap in the conversation. Your job is to find the answer of the previous dialogue. Avoid using irrelevant extra information while creating the answer. The answer should be relevant to the question before the blank. If you fill the blank with a question, it should have an answer from the agent in the given dialogue. Fill the gap marked with underline.
Teacher: Now, understand the problem? Solve this instance: customer: Hello, I am Donna Martin. 
 agent: Hello, how can I help you for the day? 
 customer: Can you please help me with booking a flight ticket from JFK to SFO? 
 agent: Can you please share your travelling dates? 
 customer: My travelling dates are from Jan 18 to Jan 20. 
 agent: Do you have class preference? 
 __ 
 agent: Do you need connection limit? 
 customer: I need connecting flight. 
 agent: Is there any other specifications? 
 customer: I need to return in morning. 
 agent: We found Southwest Airline with fare 200 and flight number is 1012 with direct flight. Shall I proceed with the booking? 
 customer: You can proceed with it. 
 agent: Your booking has been confirmed. 
 customer: Thank you for the help. 
 agent: Thank you for choosing us.
Student:
customer: I prefer economy class.