You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am visiting to World of Coca Cola factory this week at Atlanta, can you find me a ticket for me?

ASSISTANT: That's nice, share your nearest airport codes?

USER: My origin airport code is ORD and my destination airport code is ATL.

ASSISTANT: Ok, may I know your name?

USER: My name is Alexander Hall.

ASSISTANT: May I know your travelling dates?

USER: I am planning my journey dates from 09/11 to 09/13.

ASSISTANT: I have checked with your request, there is no flight in your route, because all seats were reserved already in your route.

USER: Ok, no problem. I will go with any other mode of transport to reach Atlanta.

ASSISTANT: Thank you for reaching us.

USER: Welcome.