You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you now?

USER: I want to change my existing reservation, as my friend's are asking me to spend some more days with them. Can you please help me with this?

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: I am John King.

ASSISTANT: Sorry for the inconvenience, there is no reservation found on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you for your information.