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

ASSISTANT: Hello Karen, how can I aid you?

USER: I am planning for a trip to Chicago for an interview. Can you help me?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I am planning to start on 03/16 and return back on 03/18.

ASSISTANT: Ok, can you please provide your airport codes?

USER: Make sure that connection limit is 1.

ASSISTANT: Ok.

USER: Search for the flights available from PHL to ORD.

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

USER: Take your time.

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

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: You are welcome.