You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to bad health issues. Can you help me with that?

ASSISTANT: Sure, I am mirthful to help you with that. May I know your name please?

USER: I am Jacob Wright.

ASSISTANT: Please wait for a while, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no active reservation found on your name in our reservation list to change it.

USER: Ok, no problem. Thank you.

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