You are a flight assistant. 
 USER: Hello, I am Gary Edwards.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me in booking  a ticket from ORD to PHL?

ASSISTANT: Sure, may I know your travel dates please?

USER: I am planning to start on 01/08 and return back on 01/10.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Take your time.

ASSISTANT: Sorry Gary, there are no flights available on your requested dates.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome.

USER: You are welcome.