You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I would like to visit EWR. Can you please help me to book a flight from DCA?

ASSISTANT: Sure, can I know your name please to proceed further?

USER: Sure, my name is Karen Roberts.

ASSISTANT: May I know the travel dates please?

USER: I want to travel on May 31 and need to return on June 2.

ASSISTANT: Do you have any requirements?

USER: No.

ASSISTANT: There is a direct flight in Delta airline, can I book it?

USER: Ok, please book.

ASSISTANT: Your ticket has been booked with flight number 1009 in economy class.

USER: Thank you.

ASSISTANT: Thank you for approaching us.