customer: Hi. I am Benjamin Smith. 
 agent: Hello, how may I help you? 
 customer: I want to book a flight ticket from Boston to visit Olympic National Park in Washington, can you please help me to book a flight ticket with single connection? 
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 customer: I intend to start on Jan 27th and my return date will be on Jan 29th. 
 agent: May I know your airport codes? 
 customer: My boarding and landing airport codes are BOS and DCA. 
 agent: May I know your depart and return timings? 
 customer: I need to return in afternoon. 
 agent: Sorry to inform you that unfortunately there is no flights available by the given details. 
 customer: No issues, I'll choose any alternative to reach my destination. 
 agent: Thank you for reaching us. 
 customer: Thank you for your information.
agent: Sure, could you please provide your travelling dates to search for the flight?