customer: Hello, I am Daniel Nelson. 
 agent: Hello, how can I be of your service? 
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 agent: Sure, may I know your destination airport code? 
 customer: I want to fly to Denver, CO - DEN. 
 agent: Please share your planned dates of travel. 
 customer: My trip dates are from 03/18 to 03/20. 
 agent: Let me know if you need any connection within your journey. 
 customer: Yes, I need a halt. 
 agent: Thank you for sharing your details. There are no flights available matching with your requirements. 
 customer: It's ok, not an issue. Thank you for your information. 
 agent: Thank you for reaching us.
customer: Can you please book a flight ticket from Washington, DC - DCA?