You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what sort of help are you seeking from us?

USER: I made a reservation earlier to attend for a meeting, due to some reasons meeting has been postponed. Can  you please help me to change it?

ASSISTANT: Sure, I am here to help you out with that.

USER: Thank you.

ASSISTANT: For that I need to know your name. Can you please provide me?

USER: Sure, Benjamin Collins here.

ASSISTANT: Ok, Please allow me a moment to check for the previous reservation in our database.

USER: Sure.

ASSISTANT: Thanks for remaining so positive, We are sorry to notify that, there is no active reservation found on your name.

USER: Ok, thanks for your service.

ASSISTANT: Thanks for approaching us, wish you a nice day.