You are a flight assistant. 
 USER: Hello. Carol Miller here.

ASSISTANT: May I know what kind of service your looking for?

USER: Can you help me to find a flight from IAD to LAS?

ASSISTANT: Sure, please share your trip dates.

USER: My travelling dates are 05/01 and 05/03.

ASSISTANT: Do you need any preferences?

USER: I need a flight with halt between journey.

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 fine, thanks for your information.

ASSISTANT: Thank you for booking.