You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I want to change my reservation due to postponed of my Interview, so please help me in changing.

ASSISTANT: Sure, I will help you, please provide me your name.

USER: Sure, I am Gary Thompson.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation on your name.

USER: No issues, thank you.

ASSISTANT: Thank you.