You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, please hold on a moment.

USER: Ok.

ASSISTANT: Thanks for holding on, no flight reservation found with your requested name.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thanks for your help.