You will be given a definition of a task first, then some input of the task.
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.

customer: Hello. 
 agent: Hello. How can I assist you? 
 customer: I am Melissa Baker, can you please help me in booking my flight ticket to DEN from DTW? 
 agent: Sure, can I know the travel dates please? 
 customer: Sure, my travel dates are July 27 and July 29. 
 agent: Do you have any requirements? 
 customer: I need a connecting flight. 
 agent: There is a connecting flight in Hawaiian airline, can I book it? 
 customer: Yes, do proceed with the booking. 
 __ 
 customer: Thank you for your kind service. 
 agent: Thank you for approaching us.
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: Your ticket has been booked with flight number 1002.