You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, In what way shall I assist you for the day?

USER: Help me in change my reservation?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: I am Janet Nelson.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.