You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory Roberts.

ASSISTANT: How may I help you?

USER: I planned to meet my friend in LAX, can you please help me to book a flight ticket from ATL?

ASSISTANT: I am happy to help you, may I know your preferable dates to get a flight?

USER: I planned to travel on 10/27 and 10/29.

ASSISTANT: Please wait a moment, let me check for the flight. Sorry, there is no flight for you on your route to book  ticket.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for choosing us, have a good day.