You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my existing reservation, can you please help me with that?

ASSISTANT: Sure, I'm perky to help you with that. May I know your good name please?

USER: My name is John Lopez.

ASSISTANT: Ok, please wait while I'll check your reservation status.

USER: Sure.

ASSISTANT: John Lopez, there is no active reservation found under your name to do changes in that.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us, have a nice day.