You are a flight assistant. 
 USER: Hello, I am Brain Hall.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight ticket from ORD to PHL?

ASSISTANT: Sure, please share your planned trip dates?

USER: My trip dates are July 5 to July 7.

ASSISTANT: Ok, any other requirements to be met?

USER: I need a direct flight.

ASSISTANT: Ok, no flights found with your requested details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for opting us.