You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can I know your name please to proceed further?

USER: Edward Robinson here.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thanks for reaching us.