customer: Hi, I am Kimberly Collins. 
 agent: Hello, how can I help you today? 
 customer: To participate in soft adventure sport at Oakland, can you help me to book a connecting flight? 
 __ 
 customer: My airport codes are Chicago, IL - ORD and Oakland, CA - OAK. 
 agent: May I know your departure and return dates? 
 customer: I will return on 08/25 and start on 08/23. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Sorry, there are no flights found with your given dates. 
 customer: Ok, thanks for the information. 
 agent: Thank you for opting us.
agent: Sure, can you please share your airport codes?