customer: Hello Alexander Lee here. 
 agent: Hello, How can I support you? 
 customer: I have planned to attend comic con exhibition in Philadelphia, PA - PHL. Can you be my helping hand for booking a flight ticket? 
 agent: Sure, We are here to help you. Please provide me your travelling details? 
 customer: I want to travel from Houston, TX - HOU and my travelling dates are 08/19 to 08/21. Make sure that I need a direct flight. 
 agent: Sure, Do you have any other requirements? 
 customer: And the price limit is 500. 
 agent: Give me a minute. 
 customer: Sure. 
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 customer: Ok, no problem. Thanks for your information.
agent: Thank you for waiting. There is flight with price 600 which does not matches your requirement. Thank you for reaching us. Have a nice day.