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 may I assist you? 
 customer: Nicholas Carter here. 
 agent: Glad to meet you Carter. 
 customer: I would like to go to a beach in Charlotte, so could you please book a ticket to me? 
 agent: Sure, I am here to help you. May I know your travel dates please? 
 customer: I would like to go on 05/15 and return back on 05/17. 
 __ 
 customer: My airport codes are LAS and CLT. 
 agent: Ok, hold on for a moment. Let me check the best flight for you. 
 customer: Ok, ensure it is a single connecting flight. 
 agent: I found a flight for you with AA airline and it costs you 100. Shall I proceed? 
 customer: Ok, please proceed for further. 
 agent: Your ticket has been booked with 1016 flight number. 
 customer: Thank you. 
 agent: Thank you for choosing us, have a safe flight. 
 customer: Welcome.
Output:
agent: Ok, can you please provide your airport codes?