customer: Hi. 
 agent: Hello, how can I help you today? 
 customer: Can you please book a flight ticket from DEN to OAK? 
 agent: Sure, may I know your planned travel dates? 
 customer: My trip dates are 12/31 and 01/02. 
 agent: May I know your connection limit? 
 customer: I am comfortable to travel in a single connecting flight. 
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 customer: I want to return in evening. 
 agent: Please wait for a moment. 
 customer: Sure. 
 agent: Sorry to say that, no flights were found with your given details. 
 customer: That's ok, thank you for your information. 
 agent: May I know your good name for documentation purpose? 
 customer: Alexander Mitchell here. 
 agent: Thank you for reaching us.
agent: Do you have any other specifications?