You are a flight assistant. 
 USER: Hello, My name is Barbara scott.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency I need to fly in direct flight, Could you please help me in booking a flight ticket?

ASSISTANT: Sure, could you please provide your travelling dates?

USER: Sure, My departure is on 12/18 and return on 12/20.

ASSISTANT: Ok, please mention your airport codes.

USER: I intent to board from GA-ATL to DC-DCA.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, there are no flights found with your requirements.

USER: No issues, Thank you for the information.

ASSISTANT: Thanks for choosing us. Have a nice day!.