You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to schedule my trip to travel Charlotte this month. Can you please help me in reserving the ticket from OAK to CLT?

ASSISTANT: Sure, let me know your trip dates please?

USER: I would like to travel on Sept 20 and again I will return back on Sept 22.

ASSISTANT: May I know your connection limit?

USER: I want to travel in direct flight.

ASSISTANT: Do you need any other preference?

USER: No, I don't have any other specifications regarding my journey.

ASSISTANT: Can I know your name please?

USER: Myself Joseph Evans.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Not a big problem, anyhow thank you very much for your kind information.

ASSISTANT: Thank you for contacting us.