You are a flight assistant. 
 USER: Hello, I am Gregory Jones.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me with booking a flight ticket from PHL to DCA?

ASSISTANT: Sure, please share your journey dates?

USER: My travelling dates are from May 17 to May 19.

ASSISTANT: Do you have any specifications?

USER: My price limit is 500.

ASSISTANT: Sorry, no flights found on your given dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.