You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please help me in changing of my existing reservation due to some health issue.

ASSISTANT: Sure, I am willing to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Jennifer Gonzalez.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your time, sorry no reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.