You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Kevin Adams here.

ASSISTANT: Please wait for a while.

USER: Ok.

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

USER: Not a problem, thank you.

ASSISTANT: Thank you for choosing us.