You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Jerry Thompson. I want to change my previous reservation because I made my booking with wrong airport codes. Please check and help me in changing my previous reservation.

ASSISTANT: Sure, wait a moment please.

USER: Sure, take your time.

ASSISTANT: Sorry Jerry, there is no reservation found on your name.

USER: It's ok, not an issue.

ASSISTANT: Thank you for your positive response.

USER: Welcome.