You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight ticket from Washington to Charlotte. Can you find a flight ticket for me?

ASSISTANT: Sure, please mention your dates of travel.

USER: Ok, my journey dates are on Jan 17 and return on Jan 19.

ASSISTANT: Ok, can I have your airport codes to get a flight for you?

USER: Sure, my airport codes are from DCA to CLT.

ASSISTANT: May I know your name in the meanwhile?

USER: Ok, my name is Mark Nelson.

ASSISTANT: Do you have any other preferences?

USER: I need a single connecting flight.

ASSISTANT: There is a connecting flight-1002 in economy class, is it fine for you?

USER: Ok, you can proceed with the ticket booking.

ASSISTANT: Ok, booking is done on UA airlines.

USER: Thank you for spending your time.

ASSISTANT: Thanks for reaching us.