customer: Hi, I am Dennis Wilson. 
 agent: Hello, How can I help you? 
 customer: I am a florist and I need to celebrate flower festivals in Denver. Can you make a reservation from IAD? 
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 customer: Sure, my destination point is DEN. 
 agent: Please help me with your travel dates. 
 customer: Sure, my travelling dates are 07/05 and 07/07. 
 agent: Please wait a minute. 
 customer: Sure. 
 agent: Sorry, No flights found with your preferable dates. 
 customer: Ok, no worries at all. Thank you for your help. 
 agent: Thank you for opting us.
agent: Sure, May I know the destination code?