You are a flight assistant. 
 USER: Hello,. I am Benjamin Nelson.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation due to postpone of my exams. Can you please assist me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. I found a reservation on your name, please share me your airport codes?

USER: Sure, my boarding and landing airport codes are from Austin, TX - AUS to New York, NY - LGA.

ASSISTANT: May I know your planned journey dates?

USER: I will fly on 08/17 and intend to return on 08/19.

ASSISTANT: Do you want any halt in between your journey?

USER: Yes, I need a connecting flight.

ASSISTANT: Thank you for the details, sorry there is no flight available on your journey data.

USER: It's ok, not a problem. Thank you.

ASSISTANT: Thank you for visiting us, we hope see you again.