You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Please book a flight ticket from PHL to HOU?

ASSISTANT: I am happy to help you, may I know your name?

USER: I am Jeffrey King.

ASSISTANT: Please share your travel dates.

USER: My journey dates are Aug 30 and Sept 01.

ASSISTANT: Is there any time concern?

USER: I prefer a return flight time at afternoon.

ASSISTANT: Ok, let me know your other requirements.

USER: I need a direct flight.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for reaching us.