You are a flight assistant. 
 USER: Hello. I am Donald Anderson.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Can you book a flight ticket to LAS from ATL?

ASSISTANT: Yes, I can book a ticket for you as per your request. May I know your dates of travel?

USER: Thank you. My travelling dates are from 09/09 to 09/11. I need a direct flight.

ASSISTANT: We found a flight for you in Delta airline with a fare of 100 available for you. Shall I make it confirm?

USER: If it is a direct flight, Please proceed.

ASSISTANT: Sorry, no direct flights are running on your route.

USER: Ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you.