You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amanda Davis.

ASSISTANT: How may I assist you?

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

ASSISTANT: Sure, I will help you in change of flight ticket reservation. Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: No worries, thank you for the information.

ASSISTANT: Thank you.