You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, please share me your trip dates.

USER: Sure, my travel dates are from July 30 to Aug 01.

ASSISTANT: Do you need any preferences?

USER: I need a connecting flight.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for opting us.