You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you help me to change my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, I am here to help you with this. May I know your good name please?

USER: I am Scott Mitchell.

ASSISTANT: Ok, wait for a moment please.

USER: Sure.

ASSISTANT: Sorry Scott, there is no active reservation has found on your name to change it.

USER: It's ok, not a problem, thank you.

ASSISTANT: You are welcome.