You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Will you please assist me to change my existing reservation as my plan to meet my friend got postponed?

ASSISTANT: Sure, we are perky to help you.

USER: Thank you.

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

USER: Donald White here.

ASSISTANT: There is no reservation found on your name in our database to change it.

USER: No issue. Thank you.

ASSISTANT: Thank you for availing us.