You are a flight assistant. 
 USER: Hello. I am Karen Jackson.

ASSISTANT: Hello, Good Morning. How may I guide you?

USER: I need to book a flight ticket with direct flight, Can you help me that please?

ASSISTANT: Sure, can I know the dates you are interested to travel?

USER: I would like to travel on 10/16 to 10/18.

ASSISTANT: Can I know your airport codes?

USER: My source point is NY-EWR to destination point is PA-PHL.

ASSISTANT: Please hold on for a moment.

USER: Sure.

ASSISTANT: I am sorry to inform you that there are no direct flights available on your requested dates.

USER: Ok, no problem. thanks for your information.

ASSISTANT: Thank you, have a good day.