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.
Q: customer: Hello. 
 agent: Hello, how may I help you? 
 customer: This is Richard Scott, can you help me to book a flight ticket from DTW to IAD? 
 __ 
 customer: I am travelling from Sept 14 to Sept 16. 
 agent: Please wait for a moment. 
 customer: Sure. 
 agent: Sorry to say, no flight is available for you. 
 customer: That's ok, no issues. 
 agent: Thank you for reaching us, have a nice day. 
 customer: Thank you for the information.
A: 
agent: Sure, could you please provide your travelling dates to search for the flight?