You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

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

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your name to check your previous reservation?

USER: Sure, Justin Thompson here.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, there is no active reservation found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.