You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a flight ticket from ATL to DCA, Can you please help me for booking?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates?

USER: I would like to travel on 01/14 to return on 01/16.

ASSISTANT: May I know your name?

USER: I am Charles Parker.

ASSISTANT: Do you have any other specifications?

USER: I prefer to travel in a direct flight.

ASSISTANT: Let me know your class preference?

USER: I want to travel in a business class.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for approaching us.