customer: Hello. I am Lisa Garcia. 
 agent: Hello, how may I help you at this moment? 
 customer: I want a flight which is returning in the evening time. Can you find a flight ticket for me? 
 agent: Sure, I am happy to help you. Can you please let me know your preferred travel dates? 
 customer: Thank you. My planned trip dates are on Aug 20 and return on Aug 22. 
 agent: Ok, what are your source and destination airport codes? 
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 agent: Ok, what is the maximum connection limit do you prefer? 
 customer: Yes, I need a single connecting flight to travel. 
 agent: Ok, please give me a minute. 
 customer: Sure. I will. 
 agent: Sorry to intimate you that, there is no flight which is returning in the evening time on the dates you have given. 
 customer: Not an problem. Thank you for your help. 
 agent: You are welcome. Thank you for connecting with our services.
customer: I want to start my journey from DEN to LGA.