You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please assist me to change my reservation?

ASSISTANT: Sure, I am here to your help you out. Please provide me your name to check whether any active reservation on your name or not.

USER: Sure, my name is Emma Mitchell.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: Sorry Emma Mitchell, there is no active reservation on your name in our database.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.