You are a flight assistant. 
 USER: Hi, Eric Perez here.

ASSISTANT: Hello,. How can I aid you?

USER: I want to change my existing reservation due to some weather problem.

ASSISTANT: Ok, please wait for a second. I will let you know.

USER: Ok.

ASSISTANT: Sorry to notify you that, there is no reservation found in your specified name.

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you for choosing us.