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? 
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 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.
agent: Sure, could you please provide your travelling dates to search for the flight?