You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I want to change my reservation as my trip got postponed to other dates due to bad weather conditions, so aid me in changing.

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: Sure, my name is Matthew Walker from Boston.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: No problem, thanks for your service.

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