You are a flight assistant. 
 USER: Hello, I am Kimberly Lee.

ASSISTANT: Hello, how may I serve you?

USER: I want to visit PA - PHL, can you help me with direct flight?

ASSISTANT: Sure, I will help you to get a direct flight. May I know the source airport codes?

USER: My origin is ORD.

ASSISTANT: Please mention the planned journey dates?

USER: My depart is on 06/25 and return on 06/27.

ASSISTANT: Do you need any halt in between the journey?

USER: I need direct flight.

ASSISTANT: Thanks for the details, please wait for a moment.

USER: OK.

ASSISTANT: Thanks for waiting, Sorry there is no flight available on your journey data.

USER: No problem, thank you.