You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to attend a Seminar in LAS. Can you please help me for booking the flight ticket from DFW?

ASSISTANT: May I know your planned travel dates please?

USER: My travelling dates are Jan 11 and Jan 13.

ASSISTANT: Do you need break in between your journey?

USER: I prefer single connecting flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: No.

ASSISTANT: May I know your good name please?

USER: Gregory Mitchell.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.