customer: Hello. 
 agent: Hello, how may I help you now? 
 customer: I want to attend a Seminar in Washington. Can you please help me for booking the flight ticket? 
 agent: Sure, I will help you with booking. 
 customer: Thanks. 
 agent: Can you provide me your source and destination point? 
 customer: My airport codes are IAD and DCA. 
 agent: Please share me when you planned to travel? 
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 agent: Is there any other requirement related to booking? 
 customer: I prefer direct flight. 
 agent: May I know you good name? 
 customer: Edward Martin. 
 agent: Do you have any flight timing preference? 
 customer: No, I don't have any other preferences. 
 agent: Thank you for the details, sorry there is no flight available on your given journey data. 
 customer: Anyway, thanks for the information. 
 agent: Thank you for visiting us, have a nice day ahead.
customer: My travelling dates are Oct 27 and Oct 29.