You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER:  Actually, I want to meet my friend in New York for that I reserved my ticket before one month back, but suddenly I had a another work at that time. Can you help me to change my reservation?

ASSISTANT: Sure, can I know the name on which ticket has been booked?

USER: By Helen Hill.

ASSISTANT: Happy to inform you that I have found your reservation, can I know the airport codes?

USER: I want to travel from ATL to MSP.

ASSISTANT: Please provide your new dates of journey.

USER: My trip dates are 02/28 and 03/01.

ASSISTANT: One moment, I will check whether any flights available on your new dates.

USER: Sure.

ASSISTANT: There is a flight available with Frontier airlines which costs you 600, shall I book it?

USER: Please proceed for booking.

ASSISTANT: Your booking is done, flight number is 1010.

USER: Thank you very much.

ASSISTANT: Thank you for opting us.