You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I need to travel from PHL to CLT, can you help me in doing that?

ASSISTANT: Sure, can you please share your travel dates?

USER: My trip dates are Apr 07 to Apr 09.

ASSISTANT: Do you have any class preference?

USER: I need economy class.

ASSISTANT: May I know your connection limit?

USER: I prefer with direct flight.

ASSISTANT: Do you have any other requirement that you are looking for?

USER: No.

ASSISTANT: May I know your name to proceed further?

USER: Linda Lee here.

ASSISTANT: Linda Lee, I am sorry to inform you that there is no flight available at your request.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for contacting us.