customer: Hi. 
 agent: Hello. How may I help you? 
 customer: Please help me to book a flight ticket from IAD to MSP. 
 agent: May I know your travel dates? 
 customer: My journey dates are from Oct, 12 to Oct, 14. 
 agent: Do you have any connecting preferences? 
 customer: I need  a single connecting flight. 
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 customer: I prefer an economy class to fly. 
 agent: May I know your name please? 
 customer: Dorothy Thomas. 
 agent: No flights found as per preferences at the moment. Sorry for inconvenience caused, thank you for choosing us.
agent: Is there any other concern?