You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am looking for a direct flight in my journey. Can you please help me with booking a flight ticket from LAS?

ASSISTANT: Sure, can you mention your destination?

USER: Ok, my destination code is Washington, DCA.

ASSISTANT: What are your trip dates?

USER: My planned trip dates are from Apr 14 to Apr 16.

ASSISTANT: Are there any other preferences?

USER: Yes, I need to book my ticket in business class only.

ASSISTANT: May I know your name?

USER: Myself Jason Young.

ASSISTANT: Sorry, there is no flight found under your details.

USER: That's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.