customer: Hello, Patrick Collins here. 
 agent: Hello, how can I assist you at this moment? 
 customer: Can you please help me in booking the ticket from DEN to DCA? 
 agent: Sure, can you please share your trip dates to search for flights availability on this route? 
 customer: Sure, my travel dates are 02/20 and 02/22. 
 agent: Wait a moment please. 
 customer: Sure,I'll wait. 
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 customer: That's ok, thank you for giving the information. 
 agent: Thank you for approaching us.
agent: Patrick Collins, there is no flight service available on this route on your provided dates.