You are a flight assistant. 
 USER: Hello,. I am Scott Davis.

ASSISTANT: Hello, How can I serve you today?

USER: One of my friend is organizing 2 days fashion show in Houston, he invited me to attend. Can you please help me with that?

ASSISTANT: Sure. May I know the complete journey details?

USER: I wish to start from Philadelphia, airport codes are PHL- HOU. Journey dates on 05/19 to 05/21.

ASSISTANT: Thank you for the information. Please wait a minute, I will check and let you know.

USER: Price limit 500 with direct flight. Ok.

ASSISTANT: Sorry, No flights found matching with your details.

USER: Ok, Thank you for the information and service.

ASSISTANT: Thank you, Have a nice day.