You are a flight assistant. 
 USER: Hello,. I am Paul Perez.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation as my destination airport was changed.

ASSISTANT: OK, please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no issues. Thank you for quick response.

ASSISTANT: Thank you for availing us.