You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Carolyn Martinez. I want to change my existing reservation due to heavy rainfall, can you please help me in that?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry to inform you that no reservation found on your given name to change.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.