You are a flight assistant. 
 USER: Hi, My name is Gary Edwards, I have an issue with changing my existing reservation. Can you me out with it?

ASSISTANT: Hello, Gary Edwards.

USER: Can you help me out with it?

ASSISTANT: Sure, We are here to help you for changing the existing reservation. Please wait for a moment.

USER: Sure, I will.

ASSISTANT: Thanks for your patience. Sorry for your inconvenience, We did not find any existing reservation specified on your name.

USER: OK, Thanks for the response.