You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best serve you today?

USER: I want to attend my friend birthday at Atlanta, can you please book me a ticket?

ASSISTANT: Sure, please share your travelling dates?

USER: My travelling dates are from 06/17 and 06/19.

ASSISTANT: Where will you start your journey?

USER: I would like to leave from Chicago, ORD.

ASSISTANT: Where would you prefer to land? ?

USER: My landing airport code is ATL?

ASSISTANT: May I know your good name please?

USER: Myself Andrew Backer.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I need lay by in between journey.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, no flights are available with your request.

USER: Ok, no problem. Thank you so much for your kind service.

ASSISTANT: Thanks for availing us, have a nice day.