You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you help me change my existing reservation as my plan to go for a party got postponed?

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

USER: Sure, my name is George Robinson.

ASSISTANT: Ok, wait a minute please.

USER: Ok.

ASSISTANT: Thanks for your time, sorry no reservation found a flight with your name.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for the response, have a nice day.