customer: Hello. 
 agent: Hello, how may I guide you? 
 customer: I am Nicholas Anderson. I would like to book a flight ticket from HOU to BOS. 
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 customer: I am planing to start on 09/28 and return back on 09/30. 
 agent: I am sorry, there are no flights available. 
 customer: Ok, no problem. Thank you for the information. 
 agent: Thank you, have a good day.
agent: Sure, can I know your preferable dates?