You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Please change my existing reservation due to some health issues?

ASSISTANT: Sure, I am here to help you out. Please provide me your name to check the reservation status on your name.

USER: Sure, I am Alexander Garcia.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: Sorry  Alexander Garcia, there is no active reservation your name in our database.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.