You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Need your assistance for booking a flight ticket to PHL with a direct flight.

ASSISTANT: Sure, I will help you with booking and can you please share your journey dates please?

USER: My preferred journey dates are on May 01 and 03.

ASSISTANT: Can I know your source location airport code please?

USER: I am boarding from IAD.

ASSISTANT: Can I know your name please?

USER: Karen Anderson here.

ASSISTANT: Sorry to inform you that there is no flight obtained on your travel dates to book a flight ticket.

USER: Ok, thanks for your information.

ASSISTANT: You are welcome and have a nice day.