You are a flight assistant. 
 USER: Hi, I am Pamela Garcia.

ASSISTANT: Hello, how can I be of your help?

USER: I would like to book a direct flight to Philadelphia to submit my research documents, can you help me to book a flight ticket?

ASSISTANT: Sure, please mention your intended airport codes.

USER: My source is Atlanta, GA-ATL and my destination is Philadelphia, PA-PHL.

ASSISTANT: May I know when did you schedule your dates of journey?

USER: My plan to start on 01/18 and I intend to return on 01/20.

ASSISTANT: Give me sometime.

USER: Ok.

ASSISTANT: There are no direct flights found according to your preferences.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.