You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I would like to change my recent reservation because my trip dates are got postponed, can you help me?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: I am Virginia Evans.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

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

ASSISTANT: Thank you for choosing us.