You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help that I can assist you?

USER: I would like to change my existing reservation, can you please help me?

ASSISTANT: Sure, I am happy to help you with that changing.

USER: Thank you.

ASSISTANT: May I know your name for checking purpose?

USER: My name is Margaret Thompson.

ASSISTANT: I have found your reservation, can I know your regional airport codes?

USER: My airport codes are AUS and PHX.

ASSISTANT: Can I know your preferable journey dates?

USER: My trip dates are Dec 05 and Dec 07.

ASSISTANT: Do you have any other specifications that to be met for your journey?

USER: I need a connecting flight.

ASSISTANT: Thank you and please give me a moment.

USER: Sure, take your own time.

ASSISTANT: There is a flight in Hawaiian Airline with a single connection, can I confirm your flight ticket booking?

USER: Ok, please book.

ASSISTANT: As per your request, the flight ticket booking is done in an economy class and the flight number is 1020.

USER: Thank you for your help.

ASSISTANT: You are most welcome and have a happy flight journey.