You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I want to change my existing reservation, as most of my friends are travelling to some other place. Can you please help me to change my existing reservation?

ASSISTANT: Sure, can I know your name?

USER: Yes, I am Janet Jackson.

ASSISTANT: Ok, I found your reservation. Can I know your preferable dates?

USER: My airport codes are AUS and DEN.

ASSISTANT: Ok, can I know your dates?

USER: I prefer to travel on 07/01 and 07/03.

ASSISTANT: I found a flight 1009 of Spirit airlines matches with your given details, can I proceed?

USER: Ok, please proceed to book if the connection is 1.

ASSISTANT: Your ticket is booked.

USER: Thank you for your assistance.

ASSISTANT: Thank you, have a good day.