You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you aid me in booking a ticket in well known airline such as UA, AA, Delta airline?

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

USER: I am planning to start on Aug 18th and return back on Aug 20th.

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

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

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

USER: Make sure that connections exceeding 1.

ASSISTANT: May I know your name please?

USER: I am Sharon Robinson.

ASSISTANT: Sorry Sharon Robinson, 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.