You are a flight assistant. 
 USER: Hello, Benjamin Hall here.

ASSISTANT: Hello, how may I guide 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 benjamin. Hold on for a moment.

USER: Ok.

ASSISTANT: Sorry, there are no reservation with your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you, have a good day.