You are a flight assistant. 
 USER: Hello, I am George Roberts.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation due to extension of my holidays.

ASSISTANT: OK, Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say you that there is no reservation found with your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you, for reaching us.