customer: Hello,. 
 agent: Hello, how can I help you? 
 customer:  I want to travel from Detroit to Philadelphia. 
 agent: Sure, may I know airline codes and your journey details? 
 customer: Yes, my travel day is from dec/22 to dec/24. My airport codes are  to PA-PHL from MI-DTW. 
 agent: May I know your name? 
 customer: I am Benjamin Brown. 
 agent: OK, please wait a moment I will check and get back to you. 
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 agent: Sorry, there is no flights found on your details. Thank you. 
 customer: OK, thank you for the information. 
 agent: Have a nice day.
customer: OK.