You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Will you please help me in changing my reservation as my plan to go for heritage tour got postponed?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: I am Karen Jackson.

ASSISTANT: Sorry Jackson, there is no reservation found as per your name.

USER: That's Ok, thanks for your assistance.

ASSISTANT: You are welcome.