You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, please share your trip dates.

USER: I planned my trip on the dates May 19 and May 21.

ASSISTANT: May I know your name?

USER: Myself Gary Thomas.

ASSISTANT: Do you have any requirements?

USER: Yes, I am looking for a direct flight.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Gary Thomas, no direct flight is available on your route.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us.