You are a flight assistant. 
 USER: Hello, My name is Justin King.

ASSISTANT: Hello, Justin King. How may I be your helping hand?

USER: I want to change my existing reservation due to postpone of my cricket tournament. Could you please help me?

ASSISTANT: Sure, we are glad to help you, please give a moment.

USER: Sure.

ASSISTANT: Thanks for being waiting. Sorry, there is no reservation on your given name.

USER: No issues, Thank you for your information.

ASSISTANT: Thank you for choosing us.