You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Jennifer Lewis here. Can you please help me in booking a flight ticket from DFW to LAS?

ASSISTANT: Sure, can I know your travelling dates?

USER: Sure, my travel dates are from Dec 03 to Dec 05.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I need to depart in the afternoon.

ASSISTANT: Which class do you prefer?

USER: I am comfortable with any class.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

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

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.