You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me in booking my flight ticket from PHL to DFW?

ASSISTANT: Please provide your trip dates.

USER: My travelling dates are June 13 and 15.

ASSISTANT: Do you need any connection limit?

USER: I need connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I need my return ticket at morning time.

ASSISTANT: May I know your name?

USER: Myself Charles Campbell.

ASSISTANT: There are no flights available on your routes.

USER: Thanks for your information.

ASSISTANT: Thank you for choosing us.