customer: Hello. 
 agent: Hello. 
 customer: Anthony Lewis here. 
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 customer: I would like to attend a meeting at Oakland, please help me in booking a ticket from DCA to OAK. 
 agent: Anthony Lewis, may I know your preferable dates for this journey? 
 customer: My planned travel dates are on Feb 04 and Feb 06. 
 agent: Do you have any class preference? 
 customer: Yes, I want to travel in an economy class. 
 agent: Sorry to say, there are no flights available for your journey. 
 customer: Ok, no problem. Thank you for your information. 
 agent: Thank you for reaching our services.
agent: How may I assist you now?