You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Catherine White. I want to change my reservation, can you help me?

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: Catherine White, please give me a couple of minutes, I will check with the reservation and let you know.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry White, there is no active reservation found on your name.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for availing us.