You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

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

USER: I am Janet Baker.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Janet Baker, there is no active reservation found under your name to do changes in that.

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

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