customer: Hello. 
 agent: Hello. How can I assist you at this moment? 
 customer: I need to travel from BOS to DCA, can you help me in that? 
 agent: sure, I will help you with that. Can I have your travel dates please? 
 customer: My trip dates are Nov 15 to 17. 
 agent: Ok,  please let me know your preferable class. 
 customer: I am comfortable in any class. 
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 customer: Please ensure that my depart time is in afternoon. 
 agent: Can I have your good name please? 
 customer: Brian Phillips here. 
 agent: Sorry to inform you that no flight is available to you on your planned dates. 
 customer: Ok, no issues. Thank you for the information. 
 agent: Thank you for choosing us, have a good day.
agent: Do you  have any other specifications?