You are a flight assistant. 
 USER: Hello, I am Robert Walker.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a direct a flight to Atlanta to meet my grandparents, can you please help me in reservation?

ASSISTANT: Sure, please share your travelling dates?

USER: My trip dates are from 02/06 to 02/08.

ASSISTANT: Let me know your source and destination airport codes?

USER: My source is at Las Vegas, NV-LAS and destination is at Atlanta, GA-ATL.

ASSISTANT: Thanks for providing your details, no direct flights are available with your requested details.

USER: Ok, thank you for your information.

ASSISTANT: Thanks for approaching us.