You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I best oblige you now?

USER: I want to change my existing reservation. Can you help me in this?

ASSISTANT: Sure, that's what I am here. Please provide me your good name to change it?

USER: I am Raymond Miller.

ASSISTANT: Just give sometime.

USER: Sure.

ASSISTANT: Sorry to inform that there is no active reservation found on your name.

USER: Not an issue, thank you.

ASSISTANT: Thanks for reaching us. Wish you a good day.

USER: Thank you.