customer: Hello. 
 agent: Hello. How may I assist you today? 
 customer: Please help me to book a flight ticket from DEN to DCA. 
 agent: Sure, may I know your travelling dates? 
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 agent: May I know your name? 
 customer: Linda Wilson here. 
 agent: Do you need any specifications? 
 customer: I am looking for connecting flight. 
 agent: Sorry, there are no flights found on given dates. 
 customer: That's ok, thank you for the information. 
 agent: Thank you for reaching our service.
customer: I will start on Nov, 18 and return on Nov, 20.