Definition: 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.
Input: customer: Hello. 
 agent: Hello, how can I assist you? 
 customer: I want to book the flight ticket from DTW to IAH. Can you please help me? 
 agent: Ok, please provide me your name to book a ticket. 
 customer: My name is Cynthia Martin. 
 agent: Please may I know your dates of journey? 
 customer: My travel dates are Mar 7 and Mar 9. 
 agent: Please let me know your preferred connection limit. 
 customer: I need a single connection flight. 
 __ 
 customer: I am comfortable with any class. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: There is a connecting flight available with the airfare 100 and the airlines is Hawaiian. Can I book the flight 1002? 
 customer: Please proceed. 
 agent: Ok, the flight ticket is confirmed and the departure time is 23:00 Hours and return time is 10:00 Hours. 
 customer: Thank you for the help. 
 agent: Thank you for choosing our agency.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
agent: Please let me know your class preferren.