You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at this moment?

USER: I would like to change my flight reservation as I am unwell, can you please help me out?

ASSISTANT: Sure, I am here to help you out with that. May I know your good name please to track the details?

USER: Sure, I am Gary Williams.

ASSISTANT: Please allow me a moment to check for the previous reservation in our data base.

USER: Sure.

ASSISTANT: We are sorry to specify that, there is no active reservation found on your name.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thanks for consulting us, wish you a good day.