You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am George Scott, I want to change my existing reservation. Could you help me for that?

ASSISTANT: Sure, please can I know your name? Can you provide your new preferable dates and codes?

USER: My airport codes are from LAS to MSP. My travelling dates are from 04/03 and 04/05.

ASSISTANT: There is a flight in your new requirement. Flight number is 1020, and JetBule airline. Can I proceed?

USER: Ok, proceed.

ASSISTANT: Your ticket has been booked. Thank you for choosing our airline.

USER: Thank you for booking.