You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: Could you please change my existing reservation under the name of Eric Perez?

ASSISTANT: Sure, please hold on.

USER: Ok.

ASSISTANT: Sorry, we did not find any reservation in your name.

USER: It's ok, not a problem. Thank you for your information.

ASSISTANT: Thanks for opting us, hope to serve you again.