You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: Can you please change my reservation due to postponed of my brother engagement?

ASSISTANT: Sure, I will help you with that. May I know your good name?

USER: Eric Smith is my name.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for reaching us.