customer: Hello, I am Carol Clark. 
 agent: Hello, How can I help you. 
 customer: I would like to go to a event in Philadelphia, so could you aid me in booking a flight ticket to Philadelphia? 
 agent: Sure, I will help you with that. May I know your preferable dates of travel? 
 customer: Sure, I would like to go on 02/13 and return back on 02/15. 
 agent: Ok, do you want any connections in between journey? 
 customer: Ensure it is a single connecting flight. 
 agent: Kindly mention your respective airport codes. 
 customer: My source and destination airport codes are DFW and PHL respectively. 
 agent: Thanks for providing details, please wait a minute. 
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 agent: Thanks for waiting, we are unable to provide flights on your respective dates of travel. 
 customer: That's ok, thank you for checking. 
 agent: Thank you for reaching us. 
 customer: Welcome.
customer: Sure, take your time.