You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me to book a flight ticket from DFW to DEN?

ASSISTANT: May I know your trip dates?

USER: My travelling dates are Jan 18 to Jan 20.

ASSISTANT: Do you prefer any connections?

USER: I need a single connection of flight.

ASSISTANT: May I know your specifications?

USER: No.

ASSISTANT: May I know your name?

USER: Charles Smith here.

ASSISTANT: AA airlines providing a connected flight in economy class.

USER: Ok, please proceed to book.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Thank you.