You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight from DCA to ATL. Can you please help me with the booking?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, I want to travel on Apr 12 and need to return on Apr 14.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: May I know your good name?

USER: I am Charles Gonzalez.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.