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.
Example: customer: Hello. 
 agent: Hello. How may I help you? 
 customer: I would like to do some changes in  my existing reservation, can you please help me out? 
 agent: Sure, I will help you in booking. May I know your name to proceed further? 
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 agent: Alexander Hernandez, regret to inform that there is no active reservation found under your name to amend. 
 customer: That's ok, no problem. Thank you for the information. 
 agent: Thank you for reaching us.
Example solution: customer: Sure, myself Alexander Hernandez.
Example explanation: This is pretty forward, based on the answer after the blank, the answer would be to know the name of the person, and the name is mentioned in the next dialogue to the blank

Problem: customer: Hello, myself David Baker. 
 agent: Hello. How may I help you for the day? 
 customer: I want to change my destination airport codes in my existing reservation, can you please help me out? 
 agent: Please wait a  moment, let me check with your details. 
 customer: Ok, I will wait for your response. 
 agent: Please provide me you trip details. 
 customer: My planned trip dates are 10/08 and 10/10. 
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 customer: Sure, my location airport codes are PHX and DCA. 
 agent: There is a flight available with one connection and the price is 200, can I proceed with that?'. 
 customer: Fine, please reserve me a seat. 
 agent: Your ticket has been booked with the Sprint airlines and the flight number is 1002. 
 customer: Thank you for your quick service. 
 agent: Thank you for reaching us.Have a safe journey ahead.

Solution: agent: Can you please provide your airport codes which you are travelling.