You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you?

USER: I am carol Perez. I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found in your name.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you.