You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Due to sudden work at my office, I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, we are perky to help you. May I know your good name to proceed further?

USER: Sure, my name is Linda Carter.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: We did not find any active reservation on your name in our database to change it.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for availing us.