customer: Hello, I'm Donald Turner. 
 agent: Hello, what can I do for you? 
 customer: I want a ticket from OAK to IAD, can you please help me by searching a flight in this route? 
 agent: Let me know your travel dates please? 
 customer: I would like to travel on 02/02 and return back on 02/04. 
 agent: Sorry to say, there is no flight to IAD on 02/02, Donald Turner. 
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 agent: Thanks for reaching us.
customer: That's ok, thank you.