You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Andrew King.

ASSISTANT: Ok.

USER: I am planning to go for a round trip. Can you please help me with book a direct flight?

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are 04/14 to 04/16.

ASSISTANT: Can you please mention your round trip airport code?

USER: Sure, my airport code is Charlotte, NC - CLT.

ASSISTANT: Ok, here is a flight ticket with direct flight and 1021 as flight number and 200 as fare. Shall I proceed?

USER: Please proceed to book.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thanks for your booking.

ASSISTANT: Thank you for reaching us.