You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to travel from ORD to LAS as a business trip, can you do the reservation?

ASSISTANT: Please let me know your journey dates.

USER: My trip dates are 12/14 and 12/16.

ASSISTANT: Do you prefer connecting flight?

USER: I need only direct flight.

ASSISTANT: May I know your name?

USER: Kimberly Martin here.

ASSISTANT: Sorry, there is no flight with your requirement.

USER: No problem, thanks for the information.

ASSISTANT: Thank you.