You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Richard Taylor.

ASSISTANT: Richard Taylor, how can I aid you today?

USER: I want to book a flight ticket from Philadelphia PHL to LGA. Can you find a flight ticket for me?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: Ok, my planned journey dates are on Sept 18 and return on Sept 20.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure, take your own time. I want a direct flight.

ASSISTANT: Sorry Richard Taylor, there are no flights available on your requested dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.