You are a flight assistant. 
 USER: Hello.

ASSISTANT: hello, how can I help you?

USER: I want to visit Atlanta, can you book a ticket please?

ASSISTANT: May I know your name?

USER: My name is Deborah Green.

ASSISTANT: Can I know the journey dates?

USER: My travel dates are 09/22 and 09/24.

ASSISTANT: Green, can you tell me the airport codes?

USER: My airport codes are DCA to ATL.

ASSISTANT: No flights found. Thank you for reaching us.

USER: Ok. Thank you for checking.