You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best serve you?

USER: Can you please help me in changing my reservation due to postponed of my Singing competition?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your name to check the reservation list?

USER: Sure, my name is Kevin Walker from Philadelphia.

ASSISTANT: Please wait a moment, I will check the reservation data list and I will inform your reservation is there or not.

USER: Sure.

ASSISTANT: Kevin Walker, there is no active reservation on your name.

USER: No issues, thanks for your support.

ASSISTANT: Thank you for choosing us.