customer: Hello, I am Eric Martinez. 
 agent: Hello, how can I assist you? 
 customer: I am planning to celebrate Halloween with my friends at Denver. Can you please help me to book me a ticket with single connection? 
 agent: Sure, We are here to assist you. Please share your journey dates? 
 customer: My journey dates are from 10/31 to 11/02. 
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 customer: My airport codes are from CA-OAK to CO-DEN. 
 agent: Please wait a while. I will revert you. 
 customer: Sure. 
 agent: Thanks for your patience. Unfortunately there are no flights found with your requirements. 
 customer: That's not a problem. Thank you. 
 agent: Thank you for opting our service. Have a colourful day.
agent: Kindly provide your airport codes?