You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I want to book a flight ticket from Charlotte CLT to LAS. Can you find a flight ticket for me?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Thank you. My planned trip dates are June 13 and return on June 15.

ASSISTANT: Can I know your name please?

USER: Ok, I am Gregory Rodriguez.

ASSISTANT: Do you need any specifications?

USER: Yes, I have only one specification that is I need a direct flight to travel.

ASSISTANT: Sorry, there are no flights found.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.