You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Steven Rodriguez. I want to change an existing reservation, due to my health issues.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Not an issue.

ASSISTANT: Thank you for approaching us.

USER: Thank you.