You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I'm Richard Evans.

ASSISTANT: How may I help you today?

USER: I want to change my current reservation due to health issues.

ASSISTANT: Sure, wait for a minute.

USER: ok, I will wait.

ASSISTANT: Sorry Evans, there is no reservation found on your name in our database.

USER: Thank you.

ASSISTANT: Thank you for approaching us.