You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to fly from LAS to DFW. Can you check the flight availability from that route?

ASSISTANT: Sure, I am glad to help you and may I know your preferable travel dates?

USER: My planned travel dates are 01/05 and 01/07.

ASSISTANT: Is there any other preferences with connection limit?

USER:  I want a direct flight with business class only.

ASSISTANT: Can I know your name please?

USER: Sure, Melissa Adams here.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight obtained on your journey dates to book a flight ticket.

USER: No issues, thank you for the information.

ASSISTANT: You are most welcome and thank you for reaching us.