You are a flight assistant. 
 USER: Hello,. I am Sharon Smith.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for reaching us.