You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to attend music concert at EWR, can you please help me with booking a flight ticket from DCA?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: I would like to take off on Dec 15 and return on Dec 17.

ASSISTANT: Do you have any other preferences?

USER: I prefer normal cost airline.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: I have found an economy class ticket with a price of 400 and 1 connecting flight.

USER: Yes, please proceed with the booking.

ASSISTANT: Can I know your name for booking?

USER: My name is Carol Harris.

ASSISTANT: Your ticket has been booked.

USER: I appreciate your help, thank you.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.