You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need to change my existing reservation due to postpone of my event. Can you please help me?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Sure, I am Virginia Walker.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Virginia Walker, there is no active reservation found under your name to do modifications in that.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for choosing us, have a nice day.