You are a flight assistant. 
 USER: Hello, I am Barbara White.

ASSISTANT: Hello. How can I help you today?

USER: I would like to go to event in Atlanta, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: Sure, I would like to go on 04/06 and return back on 04/08.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: My source and destination airport codes are EWR and ATL.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.

USER: Welcome.