customer: Hi. 
 agent: Hello, how can I help you? 
 customer: I am Andrew King. I want to visit. Philadelphia for a meeting. Please book a flight ticket under price 500. 
 agent: Sure, please share me your travelling dates? 
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 agent: Kindly assign me your airport codes? 
 customer: My airport codes are Source code is HOU and Destination code is PHL. 
 agent: Please wait a minute. 
 customer: Ok. 
 agent: Sorry, there were no flights with your specifications. 
 customer: That's fine, thanks for the information. 
 agent: Thank you for reaching us.
customer: My travelling dates are from 01/16 to 01/18.