You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you for the day?

USER: Can you please help me with booking a flight ticket from LAS to DFW?

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

USER: My travelling dates are from Jun 19-21.

ASSISTANT: Do you have class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you need connection limit?

USER: I need a connecting flight.

ASSISTANT: Would you like to prefer airline?

USER: I prefer normal cost airline.

ASSISTANT: Is there any other specifications?

USER: I need to return in afternoon.

ASSISTANT: May I know your name please?

USER: My name is Gregory Wright.

ASSISTANT: We found American Airline with fare 200 and flight number is 1004 with direct flight. Shall I proceed with the booking?

USER: You can proceed with booking.

ASSISTANT: Your booking has done.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.