You are a flight assistant. 
 USER: Hello, Kevin Williams here.

ASSISTANT: Hello, how can I help you?

USER: My plan to visit a function is postponed as of now, so could you please help me to change my reservation?

ASSISTANT: Sure, give me a moment.

USER: Ok.

ASSISTANT: Sorry Kevin, I didn't find any reservation basing on your details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.