You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: My name is Matthew King.

ASSISTANT: Ok.

USER: My plan to visit a function is postponed, as of now I want to change my existing reservation.

ASSISTANT: Ok, I will help you. There is no reservation as per your details to edit.

USER: That's fine, thank you for your help.

ASSISTANT: Thank you for contacting us.