You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

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

ASSISTANT: Sure, I am here to help you. Can I know your name please?

USER: Sure, my name is Kevin Lopez.

ASSISTANT: Ok, Give me a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, There is no recent reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us, Have a great day.