You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help that you are looking from my side?

USER: Can you please change my reservation?

ASSISTANT: Sure, I am happy to hep you with ticket modification that we are the top service providers for the customers in changing process.

USER: Thank you.

ASSISTANT: Can I know your name to check your previous booking?

USER: Catherine Wilson here.

ASSISTANT: Please allow me a moment.

USER: Ok.

ASSISTANT: I would like to inform you that there is no previous reservation found for this user when I have checked in our site.

USER: Ok, not an issue. Thank you.

ASSISTANT: You are most welcome and thank you for approaching us.