You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: I am Gregory Parker.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no active reservation on your name to change.

USER: No problem, thank you.

ASSISTANT: Thank you for availing us.